diff --git a/.forgejo/workflows/build-ext.yml b/.forgejo/workflows/build-ext.yml
index 304c554..9757861 100644
--- a/.forgejo/workflows/build-ext.yml
+++ b/.forgejo/workflows/build-ext.yml
@@ -14,8 +14,10 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
+      - name: Install nix
+        uses: https://github.com/cachix/install-nix-action@v25
       - name: Build extension
-        run: nix build .#extension
+        run: "nix build .#extension"
       - name: Upload extension
         uses: actions/upload-artifact@v4
         with: