diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index 2bfbdae..293ce88 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -20,7 +20,7 @@ jobs:
           - lwt
         exclude:
           - ocaml-compiler: 4.08.0
-          - concurrency: async
+            concurrency: async
 
     runs-on: ${{ matrix.os }}