diff --git a/.github/workflows/haskell-ci.yml b/.github/workflows/haskell-ci.yml
index f6a188c..0ef8bfb 100644
--- a/.github/workflows/haskell-ci.yml
+++ b/.github/workflows/haskell-ci.yml
@@ -20,7 +20,7 @@ jobs:
         run: |
           echo "${{ steps.set-matrix.outputs.matrix }}"
           echo "${{ fromJSON(steps.set-matrix.outputs.matrix) }}"
-          echo "${{ (fromJSON(steps.set-matrix.outputs.matrix).os }}"
+          echo "${{ (fromJSON(steps.set-matrix.outputs.matrix)).os }}"
           echo "${{ fromJSON(steps.set-matrix.outputs.matrix.os) }}"
     timeout-minutes: 30
   tests: