diff --git a/1systems/gum/hardware-config.nix b/1systems/gum/hardware-config.nix
index e9670a5..542b79f 100644
--- a/1systems/gum/hardware-config.nix
+++ b/1systems/gum/hardware-config.nix
@@ -34,7 +34,7 @@ in {
         prefixLength = external-netmask6;
       }];
     };
-    defaultGateway6 = external-gw6;
+    defaultGateway6 = { address = external-gw6; interface = ext-if; };
     defaultGateway = external-gw;
   };
   boot.kernelParams = [ ];