diff --git a/src/thread/win32.c b/src/thread/win32.c
index 0d933ba83..1cd16d402 100644
--- a/src/thread/win32.c
+++ b/src/thread/win32.c
@@ -85,11 +85,11 @@ int thrd_create(thrd_t *thr, thrd_start_t func, void *arg)
 	uintptr_t handle;
 
 	if (!thr || !func)
-		return EINVAL;
+		return thrd_error;
 
 	th = mem_alloc(sizeof(struct thread), NULL);
 	if (!th)
-		return ENOMEM;
+		return thrd_nomem;
 
 	th->func = func;
 	th->arg	 = arg;