diff --git a/examples/cpp/route_guide/route_guide_callback_client.cc b/examples/cpp/route_guide/route_guide_callback_client.cc
index 102061269a8..d44e9fae2d3 100644
--- a/examples/cpp/route_guide/route_guide_callback_client.cc
+++ b/examples/cpp/route_guide/route_guide_callback_client.cc
@@ -243,7 +243,11 @@ class RouteGuideClient {
         StartRead(&server_note_);
         StartCall();
       }
-      void OnWriteDone(bool /*ok*/) override { NextWrite(); }
+      void OnWriteDone(bool ok) override {
+        if (ok) {
+          NextWrite();
+        }
+      }
       void OnReadDone(bool ok) override {
         if (ok) {
           std::cout << "Got message " << server_note_.message() << " at "