diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 5ae57ed4..f4cc43c9 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -12,7 +12,7 @@ defaults:
 
 jobs:
   build:
-    runs-on: ${{ matrix }}
+    runs-on: ${{ matrix.os }} ${{ matrix.include }}
     strategy:
       matrix:
         os: [ubuntu-16.04, ubuntu-18.04, ubuntu-20.04, macos-10.15, windows-2019]