diff --git a/.github/workflows/packaging_jobs.yml b/.github/workflows/packaging_jobs.yml
index f5cc89d6c..8d979aef3 100644
--- a/.github/workflows/packaging_jobs.yml
+++ b/.github/workflows/packaging_jobs.yml
@@ -118,7 +118,7 @@ jobs:
         tools/snap/generate_dnsplugins_all.sh
         DNS_NAMES=$(echo certbot-dns-* | jq -R -s -c 'split(" ")[:-1]')
         MATRIX_PARAMS_COMBINATIONS='
-          "dns-dir": $DNS_NAMES,
+          "dns-dir": '$DNS_NAMES',
           {"build-for": "arm64", "build-on": "ubuntu-24.04-arm"},
           {"build-for": "amd64", "build-on": "ubuntu-24.04"},
         '