diff --git a/systems/x86_64-linux/attic/default.nix b/systems/x86_64-linux/attic/default.nix
index 328bc37..9b58f1e 100644
--- a/systems/x86_64-linux/attic/default.nix
+++ b/systems/x86_64-linux/attic/default.nix
@@ -76,7 +76,7 @@
           proxy_cache_valid 200 30d;
           proxy_cache_use_stale error timeout updating;
           proxy_cache_methods GET HEAD;
-          proxy_cache_bypass $request_method;
+          proxy_cache_lock on;
         '';
       };
     };