diff --git a/examples/cpp/helloworld/greeter_async_client.cc b/examples/cpp/helloworld/greeter_async_client.cc
index 33de59fb95700de0133d8a3f10b4c0075a42818b..595baae55363d1ae8589a874de92726301e41f82 100644
--- a/examples/cpp/helloworld/greeter_async_client.cc
+++ b/examples/cpp/helloworld/greeter_async_client.cc
@@ -36,6 +36,7 @@
 #include <string>
 
 #include <grpc++/grpc++.h>
+#include <grpc/support/log.h>
 
 #include "helloworld.grpc.pb.h"
 
diff --git a/examples/cpp/helloworld/greeter_async_client2.cc b/examples/cpp/helloworld/greeter_async_client2.cc
index 0902376074e84cf501cb9f5f5fd7c7d87aaaf589..fe0a2139297c1ed4fe43f76e2eeea63673d6e0d6 100644
--- a/examples/cpp/helloworld/greeter_async_client2.cc
+++ b/examples/cpp/helloworld/greeter_async_client2.cc
@@ -36,6 +36,7 @@
 #include <string>
 
 #include <grpc++/grpc++.h>
+#include <grpc/support/log.h>
 #include <thread>
 
 #include "helloworld.grpc.pb.h"
diff --git a/examples/cpp/helloworld/greeter_async_server.cc b/examples/cpp/helloworld/greeter_async_server.cc
index ead44182e5778b51510894f2f5993733d80dc7a2..bd14b0e8ee994098056553b01d314b1e27669195 100644
--- a/examples/cpp/helloworld/greeter_async_server.cc
+++ b/examples/cpp/helloworld/greeter_async_server.cc
@@ -37,6 +37,7 @@
 #include <thread>
 
 #include <grpc++/grpc++.h>
+#include <grpc/support/log.h>
 
 #include "helloworld.grpc.pb.h"