1 files changed, 1 insertions, 1 deletions

diff --git a/include/compat/pthread.h b/include/compat/pthread.h
index ed1b9dc..8211dda 100644
--- a/include/compat/pthread.h
+++ b/include/compat/pthread.h
@@ -48,7 +48,7 @@ pthread_once(pthread_once_t *once, void (*cb) (void))
         struct _pthread_win32_cb_arg arg = { .cb = cb };
         BOOL rc = InitOnceExecuteOnce(&once->once, _pthread_once_win32_cb, &arg, NULL);
         if (rc == 0)
-                return -1;
+                return EINVAL;
         else
                 return 0;
 }