diff --git a/include/thread b/include/thread
index 6bf3189..dad1ed1 100644
--- a/include/thread
+++ b/include/thread
@@ -15,7 +15,7 @@
 
     thread synopsis
 
-#define __STDCPP_THREADS __cplusplus
+#define __STDCPP_THREADS__ __cplusplus
 
 namespace std
 {
@@ -99,7 +99,7 @@
 
 #pragma GCC system_header
 
-#define __STDCPP_THREADS __cplusplus
+#define __STDCPP_THREADS__ __cplusplus
 
 _LIBCPP_BEGIN_NAMESPACE_STD