diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d4b53ca..cd6714b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -23,7 +23,7 @@ jobs:
         id: hosts
         run: |
           hostnames="$(nix eval .#nixosConfigurations --apply builtins.attrNames --json)"
-          printf "hostnames=%s\n" "${hostnames}" >> "${GITHUB_OUTPUT}" # Preserve quotes
+          printf "hostnames= %q\n" "${hostnames}" >> "${GITHUB_OUTPUT}" # Preserve quotes
 
   build:
     runs-on: ubuntu-latest