diff --git a/tests/test_serialize.cpp b/tests/test_serialize.cpp
index b403ebc..4f780a3 100644
--- a/tests/test_serialize.cpp
+++ b/tests/test_serialize.cpp
@@ -3,6 +3,8 @@
 
 #include <toml.hpp>
 
+#include <clocale>
+
 TEST_CASE("testing serialization")
 {
     using namespace toml::literals::toml_literals;