diff --git a/echo2_config.cc b/echo2_config.cc
index 33c3c2811..011a6f5bf 100644
--- a/echo2_config.cc
+++ b/echo2_config.cc
@@ -25,7 +25,7 @@ class Echo2ConfigFactory : public NamedNetworkFilterConfigFactory {
     return ProtobufTypes::MessagePtr{new Envoy::ProtobufWkt::Empty()};
   }
 
-  std::string name() override { return "echo2"; }
+  std::string name() const override { return "echo2"; }
 
   bool isTerminalFilter() override { return true; }
 };
diff --git a/http-filter-example/http_filter_config.cc b/http-filter-example/http_filter_config.cc
index 648cbaaa7..b946e96d5 100644
--- a/http-filter-example/http_filter_config.cc
+++ b/http-filter-example/http_filter_config.cc
@@ -28,7 +28,7 @@ class HttpSampleDecoderFilterConfig : public NamedHttpFilterConfigFactory {
     return ProtobufTypes::MessagePtr{new sample::Decoder()};
   }
 
-  std::string name() override { return "sample"; }
+  std::string name() const override { return "sample"; }
 
 private:
   Http::FilterFactoryCb createFilter(const sample::Decoder& proto_config, FactoryContext&) {