diff --git a/Dockerfile b/Dockerfile
index 76bfc8963..9fb6bae3f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -112,7 +112,8 @@ ENV OPENVPN_USERNAME=**None** \
     TRANSMISSION_WEB_UI= \
     PUID= \
     PGID= \
-    TRANSMISSION_WEB_HOME=
+    TRANSMISSION_WEB_HOME= \
+    DROP_DEFAULT_ROUTE=
 
 # Expose port and run
 EXPOSE 9091