diff --git a/fs/locks.c b/fs/locks.c
index 5eb259e..2045748 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1580,7 +1580,8 @@
 	cmd &= ~LOCK_NB;
 	unlock = (cmd == LOCK_UN);
 
-	if (!unlock && !(cmd & LOCK_MAND) && !(filp->f_mode & 3))
+	if (!unlock && !(cmd & LOCK_MAND) &&
+	    !(filp->f_mode & (FMODE_READ|FMODE_WRITE)))
 		goto out_putf;
 
 	error = flock_make_lock(filp, &lock, cmd);