diff --git a/.github/workflows/pre-release.yml b/.github/workflows/pre-release.yml
index 4b2cadb6..814056c5 100644
--- a/.github/workflows/pre-release.yml
+++ b/.github/workflows/pre-release.yml
@@ -36,13 +36,8 @@ jobs:
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
           extraPullNames: nix-community
       - name: Build release
-        if: ${{ matrix.target }} != ""
         run: |
           nix-build --arg crossSystem '{ config = "${{ matrix.target }}"; }'
-      - name: Build release
-        if: ${{ matrix.target }} == ""
-        run: |
-          nix-build
       - name: Upload release artifacts
         uses: actions/upload-artifact@v4
         with:
diff --git a/default.nix b/default.nix
index 3f39912e..0fe3a3ed 100644
--- a/default.nix
+++ b/default.nix
@@ -2,7 +2,7 @@
 { crossSystem ? null }:
 
 let
-  crossBuildEnabled = !isNull crossSystem;
+  crossBuildEnabled = crossSystem != null && crossSystem != "";
   crossSystems = import ./cross-systems.nix;
 
   buildPkgs = import <nixpkgs> { };