diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 0ba97cc..6863354 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -54,10 +54,13 @@ jobs:
         run: cargo build --release
 
       - name: Run fixture tests
+        env:
+          TEST_SCRIPT: ${{ inputs.test-script }}
+          GENERATED_PATH: ${{ steps.fixtures.outputs.generated-path }}
         run: |
-          chmod +x "${{ inputs.test-script }}"
+          chmod +x "$TEST_SCRIPT"
           FERRFLOW_BIN="$PWD/__ferrflow__/target/release/ferrflow" \
-            bash "${{ inputs.test-script }}" "${{ steps.fixtures.outputs.generated-path }}"
+            bash "$TEST_SCRIPT" "$GENERATED_PATH"
 
       - name: Upload test output on failure
         if: failure()
diff --git a/action.yml b/action.yml
index d55155b..bf7da9b 100644
--- a/action.yml
+++ b/action.yml
@@ -45,8 +45,10 @@ runs:
     - name: Prepare output directory
       id: prepare
       shell: bash
+      env:
+        INPUT_GENERATED_DIR: ${{ inputs.generated-dir }}
       run: |
-        GEN_DIR="${{ inputs.generated-dir }}"
+        GEN_DIR="$INPUT_GENERATED_DIR"
         if [[ -z "$GEN_DIR" ]]; then
           GEN_DIR="$(mktemp -d)/generated"
         fi
@@ -65,11 +67,14 @@ runs:
     - name: Generate fixtures
       id: generate
       shell: bash
+      env:
+        DEFINITIONS: ${{ inputs.definitions }}
+        GEN_DIR: ${{ steps.prepare.outputs.gen-dir }}
       run: |
         __fixtures__/generator/target/release/generate-fixtures \
-          --definitions "${{ inputs.definitions }}" \
-          --output "${{ steps.prepare.outputs.gen-dir }}"
-        echo "generated-path=${{ steps.prepare.outputs.gen-dir }}" >> "$GITHUB_OUTPUT"
+          --definitions "$DEFINITIONS" \
+          --output "$GEN_DIR"
+        echo "generated-path=$GEN_DIR" >> "$GITHUB_OUTPUT"
 
     - name: Cleanup
       if: always()