diff --git a/.github/workflows/pr_check.yml b/.github/workflows/pr_check.yml
index 24c5f6f..70e6fa4 100644
--- a/.github/workflows/pr_check.yml
+++ b/.github/workflows/pr_check.yml
@@ -11,10 +11,6 @@ on:
   pull_request:
     branches: ["main"]
 
-env:
-  # Stub iap package if this worlflow is running from the PR from a fork
-  STUB_IAP: ${{ github.event.pull_request.head.repo.full_name != github.repository }}
-
 jobs:
   analyze_and_test:
     name: Analyze & test
@@ -27,12 +23,12 @@ jobs:
 
       - name: Connect private iap package
         uses: webfactory/ssh-agent@v0.8.0
-        if: ${{ !env.STUB_IAP }}
+        if: ${{ github.event.pull_request.head.repo.full_name == github.repository }}
         with:
           ssh-private-key: ${{ secrets.M3_LIGHTMETER_IAP_KEY }}
 
       - name: Override iap package with stub
-        if: ${{ env.STUB_IAP }}
+        if: ${{ github.event.pull_request.head.repo.full_name != github.repository }}
         run: bash ./.github/scripts/stub_iap.sh
 
       - uses: subosito/flutter-action@v2