diff --git a/lib/cpp/test/TServerIntegrationTest.cpp b/lib/cpp/test/TServerIntegrationTest.cpp
index 42ec5d6..38cbc21 100644
--- a/lib/cpp/test/TServerIntegrationTest.cpp
+++ b/lib/cpp/test/TServerIntegrationTest.cpp
@@ -122,7 +122,7 @@
     _return = strings_;
   }
 
-  void getDataWait(std::string& _return, int32_t length) {
+  void getDataWait(std::string& _return, const int32_t length) {
     THRIFT_UNUSED_VARIABLE(_return);
     THRIFT_UNUSED_VARIABLE(length);
   }