diff --git a/src/upnp/protocol/pupnp/pupnp.h b/src/upnp/protocol/pupnp/pupnp.h
index 4c0ea78..7deb4fb 100644
--- a/src/upnp/protocol/pupnp/pupnp.h
+++ b/src/upnp/protocol/pupnp/pupnp.h
@@ -243,6 +243,12 @@
 
     // Shutdown synchronization
     bool shutdownComplete_ {false};
+
+    // Count ongoing operations
+    std::mutex ongoingOpsMtx_;
+    std::condition_variable cvOngoing_;
+    int ongoingOps_ {0};
+    bool destroying_ {false};
 };
 
 } // namespace upnp