diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 44248aa..baafa8e 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -17,7 +17,8 @@ jobs:
       - name: "List hosts"
         id: hosts
         run: |
-          nix eval .#nixosConfigurations --apply builtins.attrNames --json
+          hosts="$(nix eval .#nixosConfigurations --apply builtins.attrNames --json)"
+          echo "hostnames=${hosts}" >> "$GITHUB_OUTPUT"
     outputs:
       hosts: ${{ steps.hosts.outputs }}
 
@@ -28,7 +29,7 @@ jobs:
     needs: determine_hosts
     strategy:
       matrix:
-        hostname: ${{ fromJSON(needs.determine_hosts.outputs.hosts) }}
+        hostname: ${{ fromJSON(needs.determine_hosts.outputs.hosts.hostnames) }}
 
     steps:
       - uses: actions/checkout@v5
@@ -39,7 +40,7 @@ jobs:
         env:
           hostname: ${{ matrix.hostname }}
         run: |
-          echo "${hostname}"
+          echo "Hostname: ${hostname}"
       - run: |
           nixos-rebuild build --flake ".#${hostname}"