diff --git a/services/forgejo-runner.nix b/services/forgejo-runner.nix
index f36d832..608e9c3 100644
--- a/services/forgejo-runner.nix
+++ b/services/forgejo-runner.nix
@@ -26,6 +26,10 @@
         labels = [
           "fred-nix:docker://catthehacker/ubuntu:act-latest"
         ];
+        # Resolve `uses: org/repo@v1` against github.com — without this the
+        # runner falls back to the Forgejo instance's mirror (data.forgejo.org)
+        # which doesn't host most GitHub-marketplace actions.
+        settings.runner.default_actions_url = "https://github.com";
       };
     };
   };