diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 80ba4f4d9..1178e7875 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -52,6 +52,9 @@ jobs:
 
       - name: moon bundle
         run: moon bundle
+      
+      - name: check core size
+        run: ls -alh `find ./target/bundle -name *.core`
 
       - name: format diff
         run: |
@@ -77,6 +80,9 @@ jobs:
       - name: moon bundle
         run: moon bundle
 
+      - name: check core size
+        run: ls -alh `find ./target/bundle -name *.core`
+
       - name: format diff
         run: |
           moon fmt