diff --git a/arch/src/lib.rs b/arch/src/lib.rs
index 1ef62e025..a91f7da1b 100644
--- a/arch/src/lib.rs
+++ b/arch/src/lib.rs
@@ -8,25 +8,11 @@
 //! Supported platforms: x86_64, aarch64.
 #![allow(clippy::transmute_ptr_to_ptr, clippy::redundant_static_lifetimes)]
 
-extern crate anyhow;
-extern crate byteorder;
-extern crate hypervisor;
-extern crate libc;
 #[macro_use]
 extern crate log;
-#[cfg(feature = "acpi")]
-extern crate acpi_tables;
-extern crate linux_loader;
-extern crate serde;
-#[cfg(target_arch = "aarch64")]
-extern crate vm_fdt;
-extern crate vm_memory;
-extern crate vm_migration;
 #[cfg(target_arch = "aarch64")]
 #[macro_use]
 extern crate serde_derive;
-extern crate serde_json;
-extern crate thiserror;
 
 use std::fmt;
 use std::result;
diff --git a/arch/src/x86_64/regs.rs b/arch/src/x86_64/regs.rs
index a9822cd43..a63d115c3 100644
--- a/arch/src/x86_64/regs.rs
+++ b/arch/src/x86_64/regs.rs
@@ -162,8 +162,6 @@ pub fn configure_segments_and_sregs(
 
 #[cfg(test)]
 mod tests {
-    extern crate vm_memory;
-
     use super::*;
     use vm_memory::{GuestAddress, GuestMemoryMmap};
 
diff --git a/devices/src/acpi.rs b/devices/src/acpi.rs
index 2e626dfa6..9f7603e35 100644
--- a/devices/src/acpi.rs
+++ b/devices/src/acpi.rs
@@ -52,7 +52,6 @@ impl BusDevice for AcpiShutdownDevice {
         const SLEEP_VALUE_BIT: u8 = 2;
         if data[0] == (S5_SLEEP_VALUE << SLEEP_VALUE_BIT) | (1 << SLEEP_STATUS_EN_BIT) {
             debug!("ACPI Shutdown signalled");
-            extern crate bitflags;
             if let Err(e) = self.exit_evt.write(1) {
                 error!("Error triggering ACPI shutdown event: {}", e);
             }
diff --git a/devices/src/lib.rs b/devices/src/lib.rs
index 7f78718d3..432a1da39 100644
--- a/devices/src/lib.rs
+++ b/devices/src/lib.rs
@@ -6,20 +6,11 @@
 // found in the LICENSE-BSD-3-Clause file.
 
 //! Emulates virtual and hardware devices.
-extern crate anyhow;
+
 #[macro_use]
 extern crate bitflags;
-extern crate byteorder;
-extern crate epoll;
-extern crate libc;
 #[macro_use]
 extern crate log;
-#[cfg(feature = "acpi")]
-extern crate acpi_tables;
-extern crate vm_device;
-extern crate vm_memory;
-extern crate vm_migration;
-extern crate vmm_sys_util;
 
 #[cfg(feature = "acpi")]
 pub mod acpi;
diff --git a/hypervisor/src/arch/emulator/mod.rs b/hypervisor/src/arch/emulator/mod.rs
index 9725ac831..2c02de89c 100644
--- a/hypervisor/src/arch/emulator/mod.rs
+++ b/hypervisor/src/arch/emulator/mod.rs
@@ -4,8 +4,6 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
-extern crate thiserror;
-
 use core::fmt::Debug;
 use std::fmt::{self, Display};
 use thiserror::Error;
diff --git a/hypervisor/src/arch/x86/emulator/instructions/cmp.rs b/hypervisor/src/arch/x86/emulator/instructions/cmp.rs
index 058e31658..1bd5fdac8 100644
--- a/hypervisor/src/arch/x86/emulator/instructions/cmp.rs
+++ b/hypervisor/src/arch/x86/emulator/instructions/cmp.rs
@@ -10,8 +10,6 @@
 // CMP-Compare Two Operands
 //
 
-extern crate iced_x86;
-
 use crate::arch::emulator::{EmulationError, PlatformEmulator};
 use crate::arch::x86::emulator::instructions::*;
 use crate::arch::x86::regs::*;
diff --git a/hypervisor/src/arch/x86/emulator/instructions/mod.rs b/hypervisor/src/arch/x86/emulator/instructions/mod.rs
index 5e7f17b70..a40530d4b 100644
--- a/hypervisor/src/arch/x86/emulator/instructions/mod.rs
+++ b/hypervisor/src/arch/x86/emulator/instructions/mod.rs
@@ -4,8 +4,6 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
-extern crate iced_x86;
-
 use crate::arch::emulator::{EmulationError, PlatformEmulator, PlatformError};
 use crate::arch::x86::emulator::CpuStateManager;
 use crate::arch::x86::Exception;
diff --git a/hypervisor/src/arch/x86/emulator/instructions/mov.rs b/hypervisor/src/arch/x86/emulator/instructions/mov.rs
index c2fe19e9e..7ea908686 100644
--- a/hypervisor/src/arch/x86/emulator/instructions/mov.rs
+++ b/hypervisor/src/arch/x86/emulator/instructions/mov.rs
@@ -12,8 +12,6 @@
 //   Copies the second operand (source operand) to the first operand (destination operand).
 //
 
-extern crate iced_x86;
-
 use crate::arch::emulator::{EmulationError, PlatformEmulator};
 use crate::arch::x86::emulator::instructions::*;
 use crate::arch::x86::Exception;
diff --git a/hypervisor/src/arch/x86/emulator/instructions/movs.rs b/hypervisor/src/arch/x86/emulator/instructions/movs.rs
index 3c9e9281c..23fd04972 100644
--- a/hypervisor/src/arch/x86/emulator/instructions/movs.rs
+++ b/hypervisor/src/arch/x86/emulator/instructions/movs.rs
@@ -10,8 +10,6 @@
 // MOVS - Move Data from String to String
 //
 
-extern crate iced_x86;
-
 use crate::arch::emulator::{EmulationError, PlatformEmulator};
 use crate::arch::x86::emulator::instructions::*;
 use crate::arch::x86::regs::DF;
diff --git a/hypervisor/src/arch/x86/emulator/mod.rs b/hypervisor/src/arch/x86/emulator/mod.rs
index 92e4c61cb..662bd6cfe 100644
--- a/hypervisor/src/arch/x86/emulator/mod.rs
+++ b/hypervisor/src/arch/x86/emulator/mod.rs
@@ -4,8 +4,6 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
-extern crate iced_x86;
-
 use crate::arch::emulator::{EmulationError, EmulationResult, PlatformEmulator, PlatformError};
 use crate::arch::x86::emulator::instructions::*;
 use crate::arch::x86::regs::*;
@@ -640,8 +638,6 @@ impl<'a, T: CpuStateManager> Emulator<'a, T> {
 mod mock_vmm {
     #![allow(unused_mut)]
 
-    extern crate env_logger;
-
     use super::*;
     use crate::arch::emulator::{EmulationError, PlatformEmulator};
     use crate::arch::x86::emulator::{Emulator, EmulatorCpuState as CpuState};
diff --git a/hypervisor/src/lib.rs b/hypervisor/src/lib.rs
index e7e62d959..a64c68c44 100644
--- a/hypervisor/src/lib.rs
+++ b/hypervisor/src/lib.rs
@@ -23,10 +23,6 @@ extern crate anyhow;
 #[cfg(target_arch = "x86_64")]
 #[macro_use]
 extern crate log;
-extern crate serde;
-extern crate serde_derive;
-extern crate serde_json;
-extern crate thiserror;
 
 /// Architecture specific definitions
 #[macro_use]
diff --git a/net_util/src/lib.rs b/net_util/src/lib.rs
index 603d9f265..c9cc08dbe 100644
--- a/net_util/src/lib.rs
+++ b/net_util/src/lib.rs
@@ -10,16 +10,8 @@
 #[cfg(test)]
 #[macro_use]
 extern crate lazy_static;
-extern crate libc;
 #[macro_use]
 extern crate log;
-extern crate net_gen;
-extern crate rate_limiter;
-extern crate serde;
-extern crate virtio_bindings;
-extern crate vm_memory;
-extern crate vm_virtio;
-extern crate vmm_sys_util;
 
 mod mac;
 mod open_tap;
diff --git a/net_util/src/mac.rs b/net_util/src/mac.rs
index ff01e49a9..5fb8517c5 100644
--- a/net_util/src/mac.rs
+++ b/net_util/src/mac.rs
@@ -152,8 +152,6 @@ impl FromStr for MacAddr {
 
 #[cfg(test)]
 mod tests {
-    extern crate serde_json;
-
     use super::*;
 
     #[test]
diff --git a/pci/src/lib.rs b/pci/src/lib.rs
index 8e237bb36..d1c4caf31 100644
--- a/pci/src/lib.rs
+++ b/pci/src/lib.rs
@@ -5,12 +5,8 @@
 //! Implements pci devices and busses.
 #[macro_use]
 extern crate log;
-extern crate hypervisor;
-extern crate serde;
 #[macro_use]
 extern crate serde_derive;
-extern crate serde_json;
-extern crate vm_memory;
 
 mod bus;
 mod configuration;
diff --git a/pci/src/msi.rs b/pci/src/msi.rs
index 61f7c09d7..20dac594a 100644
--- a/pci/src/msi.rs
+++ b/pci/src/msi.rs
@@ -3,9 +3,6 @@
 // SPDX-License-Identifier: Apache-2.0 OR BSD-3-Clause
 //
 
-extern crate byteorder;
-extern crate vm_memory;
-
 use byteorder::{ByteOrder, LittleEndian};
 use std::sync::Arc;
 use vm_device::interrupt::{
diff --git a/pci/src/msix.rs b/pci/src/msix.rs
index 9ee660128..819934d7a 100644
--- a/pci/src/msix.rs
+++ b/pci/src/msix.rs
@@ -3,9 +3,6 @@
 // SPDX-License-Identifier: Apache-2.0 OR BSD-3-Clause
 //
 
-extern crate byteorder;
-extern crate vm_memory;
-
 use crate::{PciCapability, PciCapabilityId};
 use anyhow::anyhow;
 use byteorder::{ByteOrder, LittleEndian};
diff --git a/pci/src/vfio.rs b/pci/src/vfio.rs
index 7b253bcae..50f70ef99 100644
--- a/pci/src/vfio.rs
+++ b/pci/src/vfio.rs
@@ -3,8 +3,6 @@
 // SPDX-License-Identifier: Apache-2.0 OR BSD-3-Clause
 //
 
-extern crate vm_allocator;
-
 use crate::{
     msi_num_enabled_vectors, BarReprogrammingParams, MsiConfig, MsixCap, MsixConfig,
     PciBarConfiguration, PciBarRegionType, PciCapabilityId, PciClassCode, PciConfiguration,
diff --git a/src/bin/ch-remote.rs b/src/bin/ch-remote.rs
index 46e36ecb7..6b2c1c5be 100644
--- a/src/bin/ch-remote.rs
+++ b/src/bin/ch-remote.rs
@@ -5,9 +5,6 @@
 
 #[macro_use(crate_authors)]
 extern crate clap;
-extern crate api_client;
-extern crate serde_json;
-extern crate vmm;
 
 use api_client::simple_api_command;
 use api_client::Error as ApiClientError;
diff --git a/src/main.rs b/src/main.rs
index 2a5c34e67..f2661cf74 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,14 +3,8 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
-extern crate anyhow;
-extern crate signal_hook;
-extern crate vmm;
-extern crate vmm_sys_util;
-
 #[macro_use(crate_authors)]
 extern crate clap;
-
 #[macro_use]
 extern crate event_monitor;
 
diff --git a/vhost_user_block/src/lib.rs b/vhost_user_block/src/lib.rs
index b01ca2b5a..e96056664 100644
--- a/vhost_user_block/src/lib.rs
+++ b/vhost_user_block/src/lib.rs
@@ -8,11 +8,6 @@
 //
 // SPDX-License-Identifier: (Apache-2.0 AND BSD-3-Clause)
 
-extern crate block_util;
-extern crate log;
-extern crate vhost;
-extern crate vhost_user_backend;
-
 use block_util::{build_disk_image_id, Request, VirtioBlockConfig};
 use libc::EFD_NONBLOCK;
 use log::*;
diff --git a/vhost_user_net/src/lib.rs b/vhost_user_net/src/lib.rs
index 80716059b..bc2ce662d 100644
--- a/vhost_user_net/src/lib.rs
+++ b/vhost_user_net/src/lib.rs
@@ -6,11 +6,6 @@
 //
 // SPDX-License-Identifier: (Apache-2.0 AND BSD-3-Clause)
 
-extern crate log;
-extern crate net_util;
-extern crate vhost;
-extern crate vhost_user_backend;
-
 use libc::{self, EFD_NONBLOCK};
 use log::*;
 use net_util::{
diff --git a/vhost_user_net/src/main.rs b/vhost_user_net/src/main.rs
index 7d26aeb1c..e5457b388 100644
--- a/vhost_user_net/src/main.rs
+++ b/vhost_user_net/src/main.rs
@@ -8,7 +8,6 @@
 
 #[macro_use(crate_version, crate_authors)]
 extern crate clap;
-extern crate vhost_user_net;
 
 use clap::{App, Arg};
 use vhost_user_net::start_net_backend;
diff --git a/virtio-devices/src/balloon.rs b/virtio-devices/src/balloon.rs
index 6a9db34a7..7d9a71d8e 100644
--- a/virtio-devices/src/balloon.rs
+++ b/virtio-devices/src/balloon.rs
@@ -17,7 +17,6 @@ use super::{
     VirtioCommon, VirtioDevice, VirtioDeviceType, EPOLL_HELPER_EVENT_LAST, VIRTIO_F_VERSION_1,
 };
 use crate::seccomp_filters::{get_seccomp_filter, Thread};
-use crate::vm_memory::GuestMemory;
 use crate::{VirtioInterrupt, VirtioInterruptType};
 use libc::EFD_NONBLOCK;
 use seccomp::{SeccompAction, SeccompFilter};
@@ -29,6 +28,7 @@ use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
 use std::sync::mpsc;
 use std::sync::{Arc, Barrier, Mutex};
 use std::thread;
+use vm_memory::GuestMemory;
 use vm_memory::{
     Address, ByteValued, Bytes, GuestAddress, GuestAddressSpace, GuestMemoryAtomic,
     GuestMemoryError, GuestMemoryMmap,
diff --git a/virtio-devices/src/lib.rs b/virtio-devices/src/lib.rs
index 749e1c2b8..ed31b6c06 100644
--- a/virtio-devices/src/lib.rs
+++ b/virtio-devices/src/lib.rs
@@ -10,21 +10,12 @@
 
 //! Implements virtio devices, queues, and transport mechanisms.
 
-extern crate arc_swap;
-extern crate epoll;
 #[macro_use]
 extern crate event_monitor;
 #[macro_use]
 extern crate log;
-extern crate pci;
-extern crate serde;
 #[macro_use]
 extern crate serde_derive;
-extern crate serde_json;
-extern crate vhost;
-extern crate virtio_bindings;
-extern crate vm_device;
-extern crate vm_memory;
 
 use std::convert::TryInto;
 use std::io;
diff --git a/virtio-devices/src/transport/pci_common_config.rs b/virtio-devices/src/transport/pci_common_config.rs
index 6c9ab2685..d5cec30e0 100644
--- a/virtio-devices/src/transport/pci_common_config.rs
+++ b/virtio-devices/src/transport/pci_common_config.rs
@@ -5,7 +5,6 @@
 // Copyright © 2019 Intel Corporation
 //
 // SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
-extern crate byteorder;
 
 use crate::{Queue, VirtioDevice};
 use byteorder::{ByteOrder, LittleEndian};
diff --git a/virtio-devices/src/transport/pci_device.rs b/virtio-devices/src/transport/pci_device.rs
index 01ec03300..50bfc47b8 100644
--- a/virtio-devices/src/transport/pci_device.rs
+++ b/virtio-devices/src/transport/pci_device.rs
@@ -6,11 +6,6 @@
 //
 // SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
 
-extern crate pci;
-extern crate vm_allocator;
-extern crate vm_memory;
-extern crate vmm_sys_util;
-
 use super::VirtioPciCommonConfig;
 use crate::transport::VirtioTransport;
 use crate::{
diff --git a/virtio-devices/src/vhost_user/mod.rs b/virtio-devices/src/vhost_user/mod.rs
index 343a19a39..e29179aaf 100644
--- a/virtio-devices/src/vhost_user/mod.rs
+++ b/virtio-devices/src/vhost_user/mod.rs
@@ -1,12 +1,6 @@
 // Copyright 2019 Intel Corporation. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0
 
-extern crate epoll;
-extern crate net_util;
-extern crate vhost;
-extern crate virtio_bindings;
-extern crate vm_memory;
-
 use std::io;
 use vhost::Error as VhostError;
 use vm_memory::Error as MmapError;
diff --git a/vm-allocator/src/lib.rs b/vm-allocator/src/lib.rs
index 484b6e338..f7bf5ff22 100644
--- a/vm-allocator/src/lib.rs
+++ b/vm-allocator/src/lib.rs
@@ -10,9 +10,6 @@
 
 //! Manages system resources that can be allocated to VMs and their devices.
 
-extern crate libc;
-extern crate vm_memory;
-
 mod address;
 mod gsi;
 mod system;
diff --git a/vm-device/src/lib.rs b/vm-device/src/lib.rs
index 315f5b04b..77d19b986 100644
--- a/vm-device/src/lib.rs
+++ b/vm-device/src/lib.rs
@@ -5,7 +5,6 @@
 
 #[macro_use]
 extern crate serde_derive;
-extern crate vm_memory;
 
 mod bus;
 pub mod dma_mapping;
diff --git a/vm-migration/src/lib.rs b/vm-migration/src/lib.rs
index b233df2c4..994f02b0d 100644
--- a/vm-migration/src/lib.rs
+++ b/vm-migration/src/lib.rs
@@ -3,11 +3,8 @@
 // SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
 //
 
-extern crate serde;
-extern crate thiserror;
 #[macro_use]
 extern crate serde_derive;
-extern crate vm_memory;
 
 use anyhow::anyhow;
 use serde::{Deserialize, Serialize};
diff --git a/vm-virtio/src/queue.rs b/vm-virtio/src/queue.rs
index 353b15bae..9a1801d8e 100644
--- a/vm-virtio/src/queue.rs
+++ b/vm-virtio/src/queue.rs
@@ -966,8 +966,6 @@ pub mod testing {
 
 #[cfg(test)]
 pub mod tests {
-    extern crate vm_memory;
-
     use super::testing::*;
     pub use super::*;
     use vm_memory::{GuestAddress, GuestMemoryMmap};
diff --git a/vmm/src/api/mod.rs b/vmm/src/api/mod.rs
index 79dd26d19..0109a7bf5 100644
--- a/vmm/src/api/mod.rs
+++ b/vmm/src/api/mod.rs
@@ -28,9 +28,6 @@
 //!    response channel Receiver.
 //! 5. The thread handles the response and forwards potential errors.
 
-extern crate vm_device;
-extern crate vmm_sys_util;
-
 pub use self::http::start_http_fd_thread;
 pub use self::http::start_http_path_thread;
 
diff --git a/vmm/src/lib.rs b/vmm/src/lib.rs
index 8d7f664d9..12095bd3d 100644
--- a/vmm/src/lib.rs
+++ b/vmm/src/lib.rs
@@ -3,21 +3,14 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
-extern crate anyhow;
-extern crate arc_swap;
 #[macro_use]
 extern crate event_monitor;
-extern crate hypervisor;
-extern crate option_parser;
 #[macro_use]
 extern crate lazy_static;
 #[macro_use]
 extern crate log;
-extern crate serde;
 #[macro_use]
 extern crate serde_derive;
-extern crate serde_json;
-extern crate vmm_sys_util;
 #[cfg(test)]
 #[macro_use]
 extern crate credibility;
diff --git a/vmm/src/memory_manager.rs b/vmm/src/memory_manager.rs
index 8566dca81..a60b3d171 100644
--- a/vmm/src/memory_manager.rs
+++ b/vmm/src/memory_manager.rs
@@ -2,7 +2,6 @@
 //
 // SPDX-License-Identifier: Apache-2.0
 //
-extern crate hypervisor;
 #[cfg(target_arch = "x86_64")]
 use crate::config::SgxEpcConfig;
 use crate::config::{HotplugMethod, MemoryConfig, MemoryZoneConfig};
diff --git a/vmm/src/vm.rs b/vmm/src/vm.rs
index 6b719ec46..4a4297c65 100644
--- a/vmm/src/vm.rs
+++ b/vmm/src/vm.rs
@@ -11,17 +11,6 @@
 // SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
 //
 
-extern crate arch;
-extern crate devices;
-extern crate epoll;
-extern crate hypervisor;
-extern crate libc;
-extern crate linux_loader;
-extern crate net_util;
-extern crate signal_hook;
-extern crate vm_allocator;
-extern crate vm_memory;
-
 #[cfg(feature = "acpi")]
 use crate::config::NumaConfig;
 use crate::config::{