diff --git a/.github/workflows/doc.yml b/.github/workflows/doc.yml
index 241bb7a..2d47d3f 100644
--- a/.github/workflows/doc.yml
+++ b/.github/workflows/doc.yml
@@ -22,5 +22,5 @@ jobs:
       - name: Build doc
         run: nix develop --command sh -c "
           cd kernel &&
-          cargo doc --target ${{ env.TARGET }} --all-features
+          cargo doc --target ${{ matrix.target }} --all-features
           "