diff --git a/arc.m b/arc.m
index 0437abd..0006a05 100644
--- a/arc.m
+++ b/arc.m
@@ -71,8 +71,12 @@ id objc_retainAutoreleasedReturnValue(id obj)
 	return objc_retain(obj);
 #else
 	id old = pthread_getspecific(ReturnRetained);
-	pthread_setspecific(ReturnRetained, NULL);
-	return old;
+	if (obj != old)
+	{
+		objc_autorelease(old);
+		objc_retain(obj);
+	}
+	return obj;
 #endif
 }