diff --git a/.github/workflows/e2e.yml b/.github/workflows/e2e.yml
index 24a0fbb736..2f30dbc56d 100644
--- a/.github/workflows/e2e.yml
+++ b/.github/workflows/e2e.yml
@@ -110,7 +110,11 @@ jobs:
           mv stats cypress/snapshots/stats/head
           ls -l cypress/snapshots/stats/base
           ls -l cypress/snapshots/stats/head
-          echo "size_diff=$(npx tsx scripts/size.ts)" >> $GITHUB_OUTPUT
+          {
+            echo 'size_diff<<EOF'
+            npx tsx scripts/size.ts
+            echo EOF
+          } >> "$GITHUB_OUTPUT"
 
       # Size diff only needs to be posted from one job, on PRs.
       - name: Comment PR size difference