diff --git a/.github/workflows/build-iso.yml b/.github/workflows/build-iso.yml
index 15e90b21..0a6518f9 100644
--- a/.github/workflows/build-iso.yml
+++ b/.github/workflows/build-iso.yml
@@ -45,7 +45,7 @@ jobs:
           script: nix build .#nixosConfigurations.${{ matrix.target }}.config.system.build.isoImage
 
       - name: Delete nix store
-        run: sudo rm -rf /nix
+        run: sudo nix store gc && sudo nix store optimise
 
       - name: Upload iso
         uses: actions/upload-artifact@v3.1.2