diff --git a/src/core/receiver/control_thread.cc b/src/core/receiver/control_thread.cc
index db3e3841b..b2d1838f4 100644
--- a/src/core/receiver/control_thread.cc
+++ b/src/core/receiver/control_thread.cc
@@ -148,6 +148,7 @@ void ControlThread::run()
     std::cout << "Stopping GNSS-SDR, please wait!" << std::endl;
     flowgraph_->stop();
     stop_ = true;
+    flowgraph_->disconnect();
 
     //Join keyboard thread
 #ifdef OLD_BOOST