diff --git a/.github/workflows/check.yaml b/.github/workflows/check.yaml
index 6b4d244..a89f1b2 100644
--- a/.github/workflows/check.yaml
+++ b/.github/workflows/check.yaml
@@ -84,7 +84,7 @@ jobs:
       matrix:
         runs-on: [[ubuntu-22.04]]
         test-command: ['tox -e func -- -v --series focal', 'tox -e func -- -v --series jammy']
-        juju-channel: ["3.4/stable"]
+        juju-channel: ['3.4/stable']]
     steps:
 
       - uses: actions/checkout@v4