diff --git a/source/common/router/upstream_codec_filter.h b/source/common/router/upstream_codec_filter.h
index c49bba6683f17..6b542880a91dd 100644
--- a/source/common/router/upstream_codec_filter.h
+++ b/source/common/router/upstream_codec_filter.h
@@ -126,5 +126,7 @@ class UpstreamCodecFilterFactory
   }
 };
 
+DECLARE_FACTORY(UpstreamCodecFilterFactory);
+
 } // namespace Router
 } // namespace Envoy