diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d46554d..039f8ba 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ jobs:
         run: |
            sudo apt-get update
            sudo apt-get install bats bash
-	   pip install omlmd
+           pip install omlmd
       - name: run test
         run: make test