diff --git a/.forgejo/workflows/single-flow.yml b/.forgejo/workflows/single-flow.yml
index 040ef53..262c888 100644
--- a/.forgejo/workflows/single-flow.yml
+++ b/.forgejo/workflows/single-flow.yml
@@ -11,7 +11,7 @@ jobs:
     name: Build NixOS Base Image
     # Ensure 'nixos-latest' runner has Docker, SSH client, and basic Nix tools installed.
     # It seems it already does.
-    runs-on: nixos-latest
+    runs-on: nixos-custom
     env:
       NIXOS_BUILER_HOST: nixos-builder.lab
       NIXOS_BUILER_USER: runner