diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 83f144a..f569811 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macOS-latest]
-        attr: [grpc-haskell-core grpc-haskell grpc]
+        attr: [grpc-haskell-core, grpc-haskell, grpc]
 
     runs-on: ${{ matrix.os }}