diff --git a/block/raw-win32.c b/block/raw-win32.c
index d2d2d9f4d41eda66a406548aca39e9c211d0a8aa..ff3c5ea0d7135f208c95598ef11e73d285cb309a 100644
--- a/block/raw-win32.c
+++ b/block/raw-win32.c
@@ -85,6 +85,7 @@ static size_t handle_aiocb_rw(RawWin32AIOData *aiocb)
             ret_count = 0;
         }
         if (ret_count != len) {
+            offset += ret_count;
             break;
         }
         offset += len;