diff --git a/m/hut/hydra.nix b/m/hut/hydra.nix
index 1fbf33b3..5d800b0b 100644
--- a/m/hut/hydra.nix
+++ b/m/hut/hydra.nix
@@ -9,5 +9,7 @@
     buildMachinesFiles = [];
     # you will probably also want, otherwise *everything* will be built from scratch
     useSubstitutes = true;
+
+    listenHost = "0.0.0.0"; # Force IPv4
   };
 }