diff --git a/src/threading/thread.h b/src/threading/thread.h
index 10732c442..de800ecb7 100644
--- a/src/threading/thread.h
+++ b/src/threading/thread.h
@@ -157,11 +157,11 @@ private:
 	Atomic<bool> m_running;
 	Mutex m_mutex;
 
-#if !USE_CPP11_THREADS
+#ifndef USE_CPP11_THREADS
 	threadhandle_t m_thread_handle;
-#if _WIN32
-	threadid_t m_thread_id;
-#endif
+#   if _WIN32
+        threadid_t m_thread_id;
+#   endif
 #endif
 
 	static ThreadStartFunc threadProc;