diff --git a/hosts/builder/default.nix b/hosts/builder/default.nix
index e098bb3..6c6b612 100644
--- a/hosts/builder/default.nix
+++ b/hosts/builder/default.nix
@@ -41,6 +41,9 @@
     trusted-users = ["nix"];
     max-jobs = "auto";
     cores = 0;
+
+    # Ensure we can still build when missing-server is not accessible
+    fallback = true;
   };
 
   system.autoUpgrade = {