diff --git a/.github/workflows/bench-aws.yml b/.github/workflows/bench-aws.yml
index d02623d38..b90fd1466 100644
--- a/.github/workflows/bench-aws.yml
+++ b/.github/workflows/bench-aws.yml
@@ -22,21 +22,18 @@ jobs:
         run: |
           set -ex
           if [ "$TRIGGER" = 'push' ]; then
-            echo 'type=["localhost"]' >> "$GITHUB_OUTPUT"
-            echo 'include=[{"type": "localhost", "ntasks":100, "polling-limit": 300}]' >> "$GITHUB_OUTPUT"
+            echo '{"include":[{"type": "localhost", "ntasks":100, "polling-limit": 300}]}' > matrix.json
           elif [ "$TRIGGER" = 'release' ]; then
-           echo 'type=["localhost", "aws"]' >> "$GITHUB_OUTPUT"
-           echo 'include=[{"type": "localhost", "ntasks":100, "polling-limit": 300}, {"type": "aws", "ntasks":1000, "polling-limit": 600}]' >> "$GITHUB_OUTPUT"
+           echo '{"include":[{"type": "localhost", "ntasks":100, "polling-limit": 300}, {"type": "aws", "ntasks":1000, "polling-limit": 600}]}' > matrix.json
           fi
+          echo "::set-output name=matrix::$(cat matrix.json)"
   test-matrix:
     name: Test matrix
     runs-on: ubuntu-latest
     needs: define-matrix
     strategy:
       fail-fast: false
-      matrix:
-        type: ${{ fromJSON(needs.define-matrix.outputs.type) }}
-        include: ${{ fromJSON(needs.define-matrix.outputs.include) }}
+      matrix: ${{ fromJSON(needs.define-matrix.outputs.matrix) }}
     steps:
     - id: test
       name: Test matrix