diff --git a/.github/workflows/pr_check.yml b/.github/workflows/pr_check.yml
index 0f26872..ea8d38d 100644
--- a/.github/workflows/pr_check.yml
+++ b/.github/workflows/pr_check.yml
@@ -23,12 +23,12 @@ jobs:
     steps:
       - name: Connect private iap package
         uses: webfactory/ssh-agent@v0.8.0
-        if: !env.STUB_IAP
+        if: ${{ !env.STUB_IAP }}
         with:
           ssh-private-key: ${{ secrets.M3_LIGHTMETER_IAP_KEY }}
 
       - name: Override iap package with stub
-        if: env.STUB_IAP
+        if: ${{ env.STUB_IAP }}
         run: ./.github/scripts/stub_iap.sh
         shell: bash