diff --git a/kernel/base/vm/los_vm_filemap.c b/kernel/base/vm/los_vm_filemap.c
index e95cd826..0e18a5c7 100644
--- a/kernel/base/vm/los_vm_filemap.c
+++ b/kernel/base/vm/los_vm_filemap.c
@@ -261,7 +261,7 @@ STATIC UINT32 GetDirtySize(LosFilePage *fpage, struct Vnode *vnode)
 
 STATIC INT32 OsFlushDirtyPage(LosFilePage *fpage)
 {
-    UINT32 ret;
+    ssize_t ret;
     size_t len;
     char *buff = NULL;
     struct Vnode *vnode = fpage->mapping->host;