diff --git a/.github/workflows/dart_package.yml b/.github/workflows/dart_package.yml
index d3b240d..4d79aa5 100644
--- a/.github/workflows/dart_package.yml
+++ b/.github/workflows/dart_package.yml
@@ -137,14 +137,17 @@ jobs:
     runs-on: ${{inputs.runs_on}}
     timeout-minutes: ${{inputs.timeout_minutes}}
 
+    env:
+      # Cognitive complexity resolves a merge base against the diff base,
+      # which requires full history. Other runs keep a shallow clone. Values
+      # are strings because the number `0` is falsy in expressions.
+      FETCH_DEPTH: ${{inputs.run_cognitive_complexity && '0' || '1'}}
+
     steps:
       - name: 📚 Git Checkout
         uses: actions/checkout@v7
         with:
-          # Cognitive complexity resolves a merge base against the diff base,
-          # which requires full history. Other runs keep the default shallow
-          # clone for speed.
-          fetch-depth: ${{ inputs.run_cognitive_complexity && 0 || 1 }}
+          fetch-depth: ${{env.FETCH_DEPTH}}
 
       - name: 🎯 Setup Dart
         uses: dart-lang/setup-dart@v1.8.1
diff --git a/.github/workflows/flutter_package.yml b/.github/workflows/flutter_package.yml
index 25cda23..0dd457e 100644
--- a/.github/workflows/flutter_package.yml
+++ b/.github/workflows/flutter_package.yml
@@ -150,14 +150,17 @@ jobs:
     runs-on: ${{inputs.runs_on}}
     timeout-minutes: ${{inputs.timeout_minutes}}
 
+    env:
+      # Cognitive complexity resolves a merge base against the diff base,
+      # which requires full history. Other runs keep a shallow clone. Values
+      # are strings because the number `0` is falsy in expressions.
+      FETCH_DEPTH: ${{inputs.run_cognitive_complexity && '0' || '1'}}
+
     steps:
       - name: 📚 Git Checkout
         uses: actions/checkout@v7
         with:
-          # Cognitive complexity resolves a merge base against the diff base,
-          # which requires full history. Other runs keep the default shallow
-          # clone for speed.
-          fetch-depth: ${{ inputs.run_cognitive_complexity && 0 || 1 }}
+          fetch-depth: ${{env.FETCH_DEPTH}}
 
       - name: 🐦 Setup Flutter
         uses: subosito/flutter-action@v2.23.0