diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index a2dd14e..7926715 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -22,7 +22,7 @@ jobs:
       - name: "Determine hosts"
         id: hosts
         run: |
-          hostnames="$(nix eval .#nixosConfigurations --apply builtins.attrNames --json | tr '\n' ', ' | sed 's/,$//')"
+          hostnames="$(nix eval .#nixosConfigurations --apply builtins.attrNames --json)"
           printf "hostnames=%s\n" "${hostnames}" >> "${GITHUB_OUTPUT}"
 
   build:
@@ -32,7 +32,7 @@ jobs:
     needs: determine-hosts
     strategy:
       matrix:
-        hostname: ${{ fromJSON(needs.determine-hosts.outputs.hosts) }}
+        hostname: ${{ needs.determine-hosts.outputs.hosts }}
 
     steps:
       - uses: actions/checkout@v5