diff --git a/innobase/include/os0file.h b/innobase/include/os0file.h
index 9f1c18829c4..52303e735ff 100644
--- a/innobase/include/os0file.h
+++ b/innobase/include/os0file.h
@@ -144,7 +144,7 @@ struct os_file_stat_struct{
        ib_longlong	size;			/* file size */
 };
 
-#ifdef __WIN___
+#ifdef __WIN__
 typedef HANDLE  os_file_dir_t;	/* directory stream */
 #else
 typedef DIR*	os_file_dir_t;	/* directory stream */