diff -r 15bfb82194fa -r dfaeef764669 Python/thread_pthread.h
--- a/Python/thread_pthread.h   Fri Aug 15 01:23:15 2014 -0400
+++ b/Python/thread_pthread.h   Fri Aug 15 22:27:43 2014 +0200
@@ -608,7 +608,9 @@ PyThread_create_key(void)
 {
     pthread_key_t key;
     int fail = pthread_key_create(&key, NULL);
-    return fail ? -1 : key;
+    if (fail)
+        return -1;
+    return Py_SAFE_DOWNCAST(key, pthread_key_t, int);
 }
 
 void