diff --git a/modules/ripple_json/ripple_json.h b/modules/ripple_json/ripple_json.h
index 009acd54f..4a9388aca 100644
--- a/modules/ripple_json/ripple_json.h
+++ b/modules/ripple_json/ripple_json.h
@@ -38,7 +38,7 @@
 #include <deque>
 //#include <iostream>
 #include <stack>
-//#include <string>
+#include <string>
 #include <vector>
 
 // Needed before these cpptl includes