diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 58038c1..91a4fe8 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -11,7 +11,7 @@ jobs:
   build:
     name: build
 
-    runs-on: ${{ matrix.os }}
+    runs-on: ${{ matrix.platform.os }}
 
     strategy:
       fail-fast: false