diff --git a/include/ss/common.hpp b/include/ss/common.hpp
index 7546d16..f8563dc 100644
--- a/include/ss/common.hpp
+++ b/include/ss/common.hpp
@@ -4,8 +4,6 @@
 #include <cstdlib>
 #include <vector>
 
-#define _CRT_SECURE_NO_WARNINGS
-
 namespace ss {
 
 struct none {};
diff --git a/include/ss/type_traits.hpp b/include/ss/type_traits.hpp
index 294b8bb..f973781 100644
--- a/include/ss/type_traits.hpp
+++ b/include/ss/type_traits.hpp
@@ -1,5 +1,7 @@
 #pragma once
 
+#define _CRT_SECURE_NO_WARNINGS
+
 #include <cstdlib>
 #include <tuple>