diff --git a/test/custom-formatter-test.cc b/test/custom-formatter-test.cc
index 968cce2b..2fb64a83 100644
--- a/test/custom-formatter-test.cc
+++ b/test/custom-formatter-test.cc
@@ -5,10 +5,8 @@
 //
 // For the license information refer to format.h.
 
-#ifdef _MSC_VER
-#  ifndef _CRT_SECURE_NO_WARNINGS
-#    define _CRT_SECURE_NO_WARNINGS
-#  endif
+#ifndef _CRT_SECURE_NO_WARNINGS
+#  define _CRT_SECURE_NO_WARNINGS
 #endif
 
 #include "fmt/format.h"