diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 2720eec..07be266 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -31,8 +31,8 @@ jobs:
     - name: Deploy to demo server
       run: |
         nix run nixpkgs#nixos-rebuild -- switch \
-          --flake .#$[ github.ref_name == 'devel' && 'qs' || 'prod' ] \
+          --flake .#${{ github.ref_name == 'devel' && 'qs' || 'prod' }} \
           --fast \
-          --build-host ${{ env.SERVER_USER }}@$[ github.ref_name == 'devel' && env.QS_SERVER_IP || env.PROD_SERVER_IP ] \
-          --target-host ${{ env.SERVER_USER }}@$[ github.ref_name == 'devel' && env.QS_SERVER_IP || env.PROD_SERVER_IP ] \
+          --build-host ${{ env.SERVER_USER }}@${{ github.ref_name == 'devel' && env.QS_SERVER_IP || env.PROD_SERVER_IP }} \
+          --target-host ${{ env.SERVER_USER }}@${{ github.ref_name == 'devel' && env.QS_SERVER_IP || env.PROD_SERVER_IP }} \
           --use-remote-sudo