diff --git a/.gitea/workflows/push.yaml b/.gitea/workflows/push.yaml
index c5e3a9c..065e151 100644
--- a/.gitea/workflows/push.yaml
+++ b/.gitea/workflows/push.yaml
@@ -91,6 +91,8 @@ jobs:
         run: apt install -y nix-bin
       - name: Restore and cache Nix store
         uses: nix-community/cache-nix-action@v5
+        with:
+          primary-key: nix-build
       - name: Build project with Nix
         run: nix build --experimental-features 'nix-command flakes' git+$GITHUB_SERVER_URL/$GITHUB_REPOSITORY.git?ref=$GITHUB_REF_NAME#default --no-write-lock-file