diff --git a/core/sip/tcp_trsp.cpp b/core/sip/tcp_trsp.cpp
index 3ba29b30..6ef372a9 100644
--- a/core/sip/tcp_trsp.cpp
+++ b/core/sip/tcp_trsp.cpp
@@ -709,6 +709,7 @@ void tcp_server_socket::stop_threads()
 {
   for(unsigned int i=0; i<workers.size(); i++) {
     workers[i]->stop();
+    workers[i]->join();
   }
 }