diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index 7bef508d1..e7be01f51 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -29,7 +29,7 @@ jobs:
           three="{ \"file\": \"./support/docker/production/Dockerfile.nginx\", \"ref\": \"master\", \"tags\": \"chocobozzz/peertube-webserver:latest\" }"
 
           matrix="[$one,$two,$three]"
-          echo "name=matrix::{\"include\":$(echo $matrix)}" >> $GITHUB_OUTPUT
+          echo "matrix={\"include\":$matrix}" >> $GITHUB_OUTPUT
 
   docker:
     runs-on: ubuntu-latest