fix

.github/workflows/ci.yml

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index aeb76c5..c8ff7b9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -108,7 +108,7 @@
     # XXX  run: python check.py --binaryen-bin=out/bin
 
     - name: verify auto-updating causes no changes
-      run: ./auto_update_tests.py lit | git diff test/ -
+      run: ./auto_update_tests.py lit | git diff test/
       if: matrix.os == 'ubuntu-latest'
 
   build-clang: