diff --git a/src/google/protobuf/compiler/js/embed.cc b/src/google/protobuf/compiler/js/embed.cc
index 5d7163fa3e..be2ffdd433 100644
--- a/src/google/protobuf/compiler/js/embed.cc
+++ b/src/google/protobuf/compiler/js/embed.cc
@@ -32,6 +32,7 @@
 #include <cstdlib>
 #include <fstream>
 #include <iostream>
+#include <string>
 
 const char output_file[] = "well_known_types_embed.cc";