diff --git a/block/src/raw_sync.rs b/block/src/raw_sync.rs
index 0051c1b67..23f2d10e5 100644
--- a/block/src/raw_sync.rs
+++ b/block/src/raw_sync.rs
@@ -13,7 +13,8 @@ use vmm_sys_util::eventfd::EventFd;
 use crate::async_io::{
     AsyncIo, AsyncIoError, AsyncIoResult, BorrowedDiskFd, DiskFile, DiskFileError, DiskFileResult,
 };
-use crate::{DiskTopology, SECTOR_SIZE, probe_sparse_support, query_device_size};
+use crate::error::{BlockError, BlockErrorKind, BlockResult};
+use crate::{DiskTopology, SECTOR_SIZE, disk_file, probe_sparse_support, query_device_size};
 
 #[derive(Debug)]
 pub struct RawFileDiskSync {
@@ -64,6 +65,14 @@ impl DiskFile for RawFileDiskSync {
     }
 }
 
+impl disk_file::DiskSize for RawFileDiskSync {
+    fn logical_size(&self) -> BlockResult<u64> {
+        query_device_size(&self.file)
+            .map(|(logical_size, _)| logical_size)
+            .map_err(|e| BlockError::new(BlockErrorKind::Io, DiskFileError::Size(e)))
+    }
+}
+
 pub struct RawFileSync {
     fd: RawFd,
     eventfd: EventFd,