diff --git a/src/rttr/detail/misc/flat_map.h b/src/rttr/detail/misc/flat_map.h
index 767c97b..ba97cc7 100644
--- a/src/rttr/detail/misc/flat_map.h
+++ b/src/rttr/detail/misc/flat_map.h
@@ -36,7 +36,7 @@
 #include <utility>
 #include <functional>
 #include <algorithm>
-#include <ciso646> // _LIBCPP_VERSION
+//#include <ciso646> // _LIBCPP_VERSION
 
 namespace rttr
 {