diff --git a/src/google/protobuf/compiler/rust/generator_test.cc b/src/google/protobuf/compiler/rust/generator_test.cc
index 4960ef3b03171..184eb470cdd75 100644
--- a/src/google/protobuf/compiler/rust/generator_test.cc
+++ b/src/google/protobuf/compiler/rust/generator_test.cc
@@ -9,6 +9,7 @@
 
 #include <cstddef>
 #include <memory>
+#include <string>
 #include <vector>
 
 #include "google/protobuf/descriptor.pb.h"