diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8c9be51..df53e4e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,10 +6,28 @@ on:
       - 'releases/*'
 jobs:
   test:
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        runs-on:
+          - ubuntu-22.04
+          - macos-13
+    runs-on: ${{ matrix.runs-on }}
     steps:
       - uses: actions/checkout@v4
       - uses: cachix/install-nix-action@v22
       - uses: ./
       - run: actionlint
       - run: shellcheck nix-develop-gha.sh
+  test-determinate:
+    strategy:
+      matrix:
+        runs-on:
+          - ubuntu-22.04
+          - macos-13
+    runs-on: ${{ matrix.runs-on }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: ./
+      - run: actionlint
+      - run: shellcheck nix-develop-gha.sh
diff --git a/nix-develop-gha.sh b/nix-develop-gha.sh
index 44283bd..762cb81 100755
--- a/nix-develop-gha.sh
+++ b/nix-develop-gha.sh
@@ -3,7 +3,7 @@
 set -euo pipefail
 
 # Read the arguments into an array, so they can be added correctly as flags
-IFS=" " read -r -a arguments <<<"${@:-}"
+IFS=" " read -r -a arguments <<<"${@:-./#default}"
 
 with_nix_develop() {
 	nix develop --ignore-environment "${arguments[@]}" --command "$@"