diff --git a/hosts/hydra-1/configuration.nix b/hosts/hydra-1/configuration.nix
index 24874df..90f588e 100644
--- a/hosts/hydra-1/configuration.nix
+++ b/hosts/hydra-1/configuration.nix
@@ -44,6 +44,9 @@
     listenHost = "localhost";
     notificationSender = "noreply@hydra.clerie.de";
     useSubstitutes = true;
+    extraConfig = ''
+      binary_cache_public_uri = https://nix-cache.clerie.de
+    '';
   };
 
   services.nix-serve = {