diff --git a/include/internal/catch_matchers_string.h b/include/internal/catch_matchers_string.h
index e3772cbf..2192ee8f 100644
--- a/include/internal/catch_matchers_string.h
+++ b/include/internal/catch_matchers_string.h
@@ -10,6 +10,8 @@
 
 #include "catch_matchers.hpp"
 
+#include <string>
+
 namespace Catch {
 namespace Matchers {