diff --git a/.github/workflows/build_push.yml b/.github/workflows/build_push.yml
index e09e8b18..c897b901 100644
--- a/.github/workflows/build_push.yml
+++ b/.github/workflows/build_push.yml
@@ -63,7 +63,7 @@ jobs:
       - id: generate-matrices
         name: Create output matrices
         run: |
-          echo '{"chunk":[{"number":1,"modules":["src:all:kavita:assembleRelease"]}]}' > $GITHUB_OUTPUT
+          echo "matrix={\"chunk\":[{\"number\":1,\"modules\":[\"src:all:kavita:assembleRelease\"]}]}" >> $GITHUB_OUTPUT
 
   build:
     name: Build extensions (${{ matrix.chunk.number }})