diff --git a/test/test_to_u32string.cpp b/test/test_to_u32string.cpp
index 1d5bd662..50262f31 100644
--- a/test/test_to_u32string.cpp
+++ b/test/test_to_u32string.cpp
@@ -29,6 +29,7 @@ SOFTWARE.
 #include "unit_test_framework.h"
 
 #include <ostream>
+#include <limits>
 
 #include "etl/format_spec.h"
 #include "etl/to_u32string.h"