diff --git a/block_util/src/async_io.rs b/block_util/src/async_io.rs
index e00f03ad1..3eb5b8961 100644
--- a/block_util/src/async_io.rs
+++ b/block_util/src/async_io.rs
@@ -104,7 +104,7 @@ impl DiskTopology {
 
 pub type DiskFileResult<T> = std::result::Result<T, DiskFileError>;
 
-pub trait DiskFile: Send + Sync {
+pub trait DiskFile: Send {
     fn size(&mut self) -> DiskFileResult<u64>;
     fn new_async_io(&self, ring_depth: u32) -> DiskFileResult<Box<dyn AsyncIo>>;
     fn topology(&mut self) -> DiskTopology {
@@ -127,7 +127,7 @@ pub enum AsyncIoError {
 
 pub type AsyncIoResult<T> = std::result::Result<T, AsyncIoError>;
 
-pub trait AsyncIo: Send + Sync {
+pub trait AsyncIo: Send {
     fn notifier(&self) -> &EventFd;
     fn read_vectored(
         &mut self,