diff --git a/.github/workflows/packaging_jobs.yml b/.github/workflows/packaging_jobs.yml
index 846746855..5402552cf 100644
--- a/.github/workflows/packaging_jobs.yml
+++ b/.github/workflows/packaging_jobs.yml
@@ -116,7 +116,7 @@ jobs:
     - id: set-matrix
       run: |
         DNS_NAMES=$(echo certbot-dns-* | jq -R -s -c 'split(" ")[:-1]')
-        echo 'dns-dirs='$DNS_NAMES >> $GITHUB_OUTPUT
+        echo 'dns-dirs='$DNS_NAMES >> "$GITHUB_OUTPUT"
   gha_build_dns:
     name: Build ${{ matrix.build-for }} snap
     needs: generate_dns_list_matrix