diff --git a/.github/workflows/build_osx.yml b/.github/workflows/build_osx.yml
index 00e5c95dab..32382ec3c7 100644
--- a/.github/workflows/build_osx.yml
+++ b/.github/workflows/build_osx.yml
@@ -58,7 +58,7 @@ jobs:
       - name: ccache
         uses: hendrikmuhs/ccache-action@v1
         with:
-          key: mac-${{ runner.arch }}
+          key: mac-${{ matrix.arch }}
 
       - name: Run Build Script
         shell: bash