diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 40b5cdbc2..277ea6b70 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -9,7 +9,7 @@ jobs:
       matrix:
         platform: [ubuntu-latest, macos-latest, windows-latest]
         python-version: [2.7, 3.5, 3.6, 3.7]
-     runs-on: ${{ matrix.platform }}
+    runs-on: ${{ matrix.platform }}
 
     steps:
     - uses: actions/checkout@v1