diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 548eec0966..497ec084a8 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -11,6 +11,8 @@ jobs:
     strategy:
       matrix:
         arch: [arm64, arm]
+    env:
+      EXTRA_FLAGS: 'target_cpu="${{ matrix.arch }}"'
     steps:
       - uses: actions/checkout@v2
       - run: brew install ninja