diff --git a/config/c3d2.nix b/config/c3d2.nix
index 481f8fbb..8906d849 100644
--- a/config/c3d2.nix
+++ b/config/c3d2.nix
@@ -153,9 +153,9 @@ in {
       binaryCachePublicKeys = lib.mkIf (config.networking.hostName != "hydra") [
         (builtins.readFile ../hosts/hydra/cache-pub.key)
       ];
-      binaryCaches = lib.mkIf (config.networking.hostName != "hydra") [
-        "https://hydra.hq.c3d2.de"
-      ];
+      binaryCaches = lib.mkIf (config.networking.hostName != "hydra") (
+        lib.mkBefore [ "https://hydra.hq.c3d2.de" ]
+      );
       gc = {
         automatic = true;
         dates = "06:00";