diff --git a/Dockerfile b/Dockerfile
index 41c2a8e..b9ab1ee 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -18,4 +18,4 @@ RUN apk add mailx
 USER 1000:1000
 EXPOSE 8000
 
-ENTRYPOINT ["/usr/bin/webmention-filer"]
+ENTRYPOINT ["/usr/bin/webmention-filer", "-d", "$DOMAIN"]