diff --git a/include/internal/catch_stringref.cpp b/include/internal/catch_stringref.cpp
index 41c6ac5c..127406ff 100644
--- a/include/internal/catch_stringref.cpp
+++ b/include/internal/catch_stringref.cpp
@@ -14,6 +14,7 @@
 #include "catch_stringref.h"
 
 #include <ostream>
+#include <cstring>
 
 namespace Catch {
     auto StringRef::fromRaw( char const* rawChars ) -> StringRef {