diff --git a/.forgejo/workflows/demo.yaml b/.forgejo/workflows/demo.yaml
index f2ea478..430743d 100644
--- a/.forgejo/workflows/demo.yaml
+++ b/.forgejo/workflows/demo.yaml
@@ -12,6 +12,6 @@ jobs:
     runs-on:
     - docker
     - "${{ matrix.arch }}"
-    container: debian:"${{ matrix.codename }}"
+    container: "debian:${{ matrix.codename }}"
     steps:
     - run: sleep 60