diff --git a/tests/unit/tests_high_five.hpp b/tests/unit/tests_high_five.hpp
index 25839c69e..d9a4ed34d 100644
--- a/tests/unit/tests_high_five.hpp
+++ b/tests/unit/tests_high_five.hpp
@@ -21,6 +21,7 @@
 // The list of identifiers is taken from `Boost::Predef`.
 #if defined(_WIN32) || defined(_WIN64) || defined(__WIN32__) || defined(__TOS_WIN__) || \
     defined(__WINDOWS__)
+#define NOMINMAX
 #include <Windows.h>
 #endif