diff --git a/fs/ntfs3/ntfs_fs.h b/fs/ntfs3/ntfs_fs.h
index 2c791222c4e2..81a9644a58a4 100644
--- a/fs/ntfs3/ntfs_fs.h
+++ b/fs/ntfs3/ntfs_fs.h
@@ -947,7 +947,7 @@ static inline bool run_is_empty(struct runs_tree *run)
 /* NTFS uses quad aligned bitmaps. */
 static inline size_t bitmap_size(size_t bits)
 {
-	return ALIGN((bits + 7) >> 3, 8);
+	return (u32)ALIGN((bits + 7) >> 3, 8);
 }
 
 #define _100ns2seconds 10000000