diff --git a/test/test_to_string.cpp b/test/test_to_string.cpp
index 844c9790..4e1c7262 100644
--- a/test/test_to_string.cpp
+++ b/test/test_to_string.cpp
@@ -32,6 +32,7 @@ SOFTWARE.
 #include <iomanip>
 #include <limits>
 #include <ostream>
+#include <limits>
 #include <sstream>
 
 #include "etl/format_spec.h"