diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 692abe00..2a3a594f 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -133,4 +133,4 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: check-whitespaces
-        run: git diff-tree --check $(git hash-object -t tree /dev/null) HEAD
+        run: git diff-tree --check main HEAD