diff --git a/include/threadpool.h b/include/threadpool.h
index 7f6c9e9..4b0a70d 100644
--- a/include/threadpool.h
+++ b/include/threadpool.h
@@ -50,7 +50,7 @@ ANN static inline int gwt_signal(gwtcond_t *cond) {
 }
 ANN static inline int gwt_create(gwtthread_t *thread, gwtreturn_t (*fun)(void*), void *arg) {
   *thread = CreateThread(NULL, 0, fun, arg, 0, NULL);
-  return 0;
+  return !!*thread;
 }
 ANN static inline void gwt_join(gwtthread_t thread) {
   WaitForSingleObject(thread, INFINITE); // dword // (DWORD)0xFFFFFFFF on error
@@ -102,7 +102,7 @@ ANN static inline void gwt_cond_end(gwtcond_t *cond) {
   pthread_cond_destroy(cond); // int
 }
 ANN static inline bool gwt_create(gwtthread_t *thread, gwtreturn_t (*fun)(void*), void *arg) {
-  return !pthread_create(thread, NULL, fun, arg); // int
+  return pthread_create(thread, NULL, fun, arg); // int
 }
 #endif
 
diff --git a/src/threadpool.c b/src/threadpool.c
index 261297e..670a1e5 100644
--- a/src/threadpool.c
+++ b/src/threadpool.c
@@ -56,8 +56,8 @@ ANN static bool utils(threadpool_t *p) {
 
 ANN static bool start(threadpool_t *p, const uint32_t thread_count) {
   for(uint32_t i = 0; i < thread_count; i++) {
-    if(!gwt_create(&p->threads[i], threadpool_thread, p))
-      return false;
+    const int ret = gwt_create(&p->threads[i], threadpool_thread, p);
+    if(ret) return false;
     p->started++;
   }
   return true;
@@ -75,7 +75,6 @@ threadpool_t *new_threadpool(const uint32_t thread_count, const uint32_t queue_s
     free_threadpool(p);
     return NULL;
   }
-
   return p;
 }