diff --git a/src/google/protobuf/json/internal/zero_copy_buffered_stream_test.cc b/src/google/protobuf/json/internal/zero_copy_buffered_stream_test.cc
index b00e4c43b6..a7d9704cb7 100644
--- a/src/google/protobuf/json/internal/zero_copy_buffered_stream_test.cc
+++ b/src/google/protobuf/json/internal/zero_copy_buffered_stream_test.cc
@@ -13,6 +13,7 @@
 
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
+#include "absl/strings/str_cat.h"
 #include "absl/strings/string_view.h"
 #include "google/protobuf/io/test_zero_copy_stream.h"
 #include "google/protobuf/stubs/status_macros.h"