diff --git a/.github/workflows/metrics.yml b/.github/workflows/metrics.yml
index 1e45372a71..ef2b332698 100644
--- a/.github/workflows/metrics.yml
+++ b/.github/workflows/metrics.yml
@@ -37,12 +37,13 @@ jobs:
         make -C tools/fused fused
         echo "##[set-output name=size;]$(wc -c < fused-src/iutest.hpp)"
         echo "##[set-output name=min_size;]$(wc -c < fused-src/iutest.min.hpp)"
+        echo "##[set-output name=wandbox_min_size;]$(wc -c < fused-src/iutest.wandbox.min.hpp)"
     - name: send metrics
       run: |
         curl \
           -H "Content-Type: application/json" \
           -X POST \
-          -d "{\"branch\": \"${GITHUB_REF#refs/heads/}\", \"commit\": \"${GITHUB_SHA}\", \"size\": \"${{ steps.fused.outputs.size }}\", \"min\": \"${{ steps.fused.outputs.min_size }}\"}" \
+          -d "{\"branch\": \"${GITHUB_REF#refs/heads/}\", \"commit\": \"${GITHUB_SHA}\", \"size\": \"${{ steps.fused.outputs.size }}\", \"min\": \"${{ steps.fused.outputs.min_size }}\", \"wandbox\": \"${{ steps.fused.outputs.wandbox_min_size }}\"}" \
           ${{ secrets.FUSED_METRICS_WEBHOOK }}