diff --git a/lib/cpp/src/async/TAsyncProtocolProcessor.cpp b/lib/cpp/src/async/TAsyncProtocolProcessor.cpp
index 05d504b..eaa86e0 100644
--- a/lib/cpp/src/async/TAsyncProtocolProcessor.cpp
+++ b/lib/cpp/src/async/TAsyncProtocolProcessor.cpp
@@ -43,6 +43,7 @@
     std::tr1::function<void(bool healthy)> _return,
     boost::shared_ptr<TProtocol> oprot,
     bool healthy) {
+  (void) oprot;
   // This is a stub function to hold a reference to oprot.
   return _return(healthy);
 }