diff --git a/src/ttynvt.c b/src/ttynvt.c
index 32229bf..333ae8a 100644
--- a/src/ttynvt.c
+++ b/src/ttynvt.c
@@ -476,8 +476,8 @@ static void ttynvt_open(fuse_req_t req, struct fuse_file_info *info)
         goto open_err;
     }
 
-    if ((res = pthread_mutex_init(&tty->tty_lock, NULL) < 0) ||
-        (res = pthread_mutex_init(&tty->poll_lock, NULL) < 0) ||
+    if ((res = pthread_mutex_init(&tty->tty_lock, NULL)) ||
+        (res = pthread_mutex_init(&tty->poll_lock, NULL)) ||
         (res = pthread_create(&tty->ptid_poll, NULL, &_read_net, tty)))
     {
         errno = res;