diff --git a/fs/cifs/cifsacl.h b/fs/cifs/cifsacl.h
index dd95a6fa24bf..eb428349f29a 100644
--- a/fs/cifs/cifsacl.h
+++ b/fs/cifs/cifsacl.h
@@ -45,7 +45,7 @@
  */
 #define DEFAULT_SEC_DESC_LEN (sizeof(struct cifs_ntsd) + \
 			      sizeof(struct cifs_acl) + \
-			      (sizeof(struct cifs_ace) * 3))
+			      (sizeof(struct cifs_ace) * 4))
 
 /*
  * Maximum size of a string representation of a SID: