diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4331f37..db558c2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,9 +12,9 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-	include:
-	- os: windows-latest
-	- os: macOS-latest
+        include:
+        - os: windows-latest
+        - os: macOS-latest
         ghc:
           - "8.6.5"
           - "8.8.3"