diff --git a/pingpong/pingpong.c b/pingpong/pingpong.c
index 16ee29e..a981bb3 100644
--- a/pingpong/pingpong.c
+++ b/pingpong/pingpong.c
@@ -28,6 +28,7 @@ void * pongd_thread(void * pdata) {
             }
         }else {
             printf("------thread shutdown------------\n");
+            free(buf);
             break;
         }
     }