diff --git a/README.md b/README.md
index aace2bb..1b4c75b 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,7 @@ jobs:
       - uses: julia-actions/setup-julia@v1
         with:
           version: ${{ matrix.julia-version }}
+          arch: ${{ matrix.julia-arch }}
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
 ```