diff --git a/net_util/build.rs b/net_util/build.rs
new file mode 100644
index 000000000..8a89660d9
--- /dev/null
+++ b/net_util/build.rs
@@ -0,0 +1,8 @@
+// Copyright © 2024 Intel Corporation
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+fn main() {
+    println!("cargo::rustc-check-cfg=cfg(fuzzing)");
+}
diff --git a/virtio-devices/build.rs b/virtio-devices/build.rs
new file mode 100644
index 000000000..8a89660d9
--- /dev/null
+++ b/virtio-devices/build.rs
@@ -0,0 +1,8 @@
+// Copyright © 2024 Intel Corporation
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+fn main() {
+    println!("cargo::rustc-check-cfg=cfg(fuzzing)");
+}
diff --git a/vmm/build.rs b/vmm/build.rs
new file mode 100644
index 000000000..8a89660d9
--- /dev/null
+++ b/vmm/build.rs
@@ -0,0 +1,8 @@
+// Copyright © 2024 Intel Corporation
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+fn main() {
+    println!("cargo::rustc-check-cfg=cfg(fuzzing)");
+}