diff --git a/src/core/receiver/control_thread.cc b/src/core/receiver/control_thread.cc
index 0710da730..8eb49563c 100644
--- a/src/core/receiver/control_thread.cc
+++ b/src/core/receiver/control_thread.cc
@@ -114,7 +114,7 @@ void ControlThread::run()
         {
             flowgraph_->connect();
         }
-    catch (const std::exception e)
+    catch (const std::exception &e)
         {
             LOG(ERROR) << e.what();
             return;