diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8f2495d..0a7c13f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -95,6 +95,10 @@ jobs:
         run: nix-instantiate -E 'builtins.currentTime' --eval
         if: success() || failure()
         shell: sh -l {0}
+      - name: Test zsh
+        run: nix-instantiate -E 'builtins.currentTime' --eval
+        if: success() || failure()
+        shell: zsh --login --interactive {0}
       - name: Install Nix again (noop)
         uses: ./
         with: