diff --git a/src/json_utils.h b/src/json_utils.h
index 21e204328058..3ece077a9170 100644
--- a/src/json_utils.h
+++ b/src/json_utils.h
@@ -6,6 +6,7 @@
 #include <iomanip>
 #include <ostream>
 #include <limits>
+#include <string>
 
 namespace node {