diff --git a/echo2_config.cc b/echo2_config.cc
index 2fab2a4fc..6000f67d2 100644
--- a/echo2_config.cc
+++ b/echo2_config.cc
@@ -30,6 +30,7 @@ class Echo2ConfigFactory : public NamedNetworkFilterConfigFactory {
   Network::FilterFactoryCb createFilterFactory(const Json::Object&, FactoryContext&) override {
     NOT_IMPLEMENTED_GCOVR_EXCL_LINE;
   }
+  bool isTerminalFilter() override { return true; }
 };
 
 /**