diff --git a/.github/workflows/size-report.yml b/.github/workflows/size-report.yml
index 42c8c94..b507c20 100644
--- a/.github/workflows/size-report.yml
+++ b/.github/workflows/size-report.yml
@@ -58,6 +58,8 @@ jobs:
         id: calculate-size
         run: |
           echo "$(pwd)/dist"
+          PREVIOUS_SIZE=$(pnpm tsx scripts/size-report.ts $DIST_PATH)
+          echo "PREVIOUS_SIZE=$PREVIOUS_SIZE" >> $GITHUB_ENV
           CURRENT_SIZE=$(pnpm tsx scripts/size-report.ts)
           echo "CURRENT_SIZE=$CURRENT_SIZE" >> $GITHUB_ENV