diff --git a/test/test_to_string.cpp b/test/test_to_string.cpp
index df174100..0578ff87 100644
--- a/test/test_to_string.cpp
+++ b/test/test_to_string.cpp
@@ -31,6 +31,7 @@ SOFTWARE.
 #include <sstream>
 #include <iomanip>
 #include <ostream>
+#include <limits>
 
 #include "etl/format_spec.h"
 #include "etl/string.h"