diff --git a/common/network/Socket.h b/common/network/Socket.h
index 53f957e..874a59c 100644
--- a/common/network/Socket.h
+++ b/common/network/Socket.h
@@ -82,6 +82,7 @@
   class ConnectionFilter {
   public:
     virtual bool verifyConnection(Socket* s) = 0;
+    virtual ~ConnectionFilter() {}
   };
 
   class SocketListener {