diff --git a/.github/workflows/checks.yaml b/.github/workflows/checks.yaml
index 7f9eb1d1..6f2af908 100644
--- a/.github/workflows/checks.yaml
+++ b/.github/workflows/checks.yaml
@@ -11,6 +11,18 @@ jobs:
     runs-on: ubuntu-latest
     
     steps:
+    - name: "Block Fork PRs"
+      env:
+        HEAD_REPO: ${{ github.event.pull_request.head.repo.full_name }}
+        BASE_REPO: ${{ github.repository }}
+      run: |
+        echo "Head repo: $HEAD_REPO"
+        echo "Base repo: $BASE_REPO"
+        if [ "$HEAD_REPO" != "$BASE_REPO" ]; then
+          echo "PRs from forked repositories are not allowed."
+          exit 1
+        fi
+
     - name: "Checkout"
       uses: actions/checkout@v2
       with:
@@ -25,6 +37,9 @@ jobs:
       run: |
         npm install
         npx lerna bootstrap
+    - name: Run Lint
+      run: npx lerna run eslint
+
     - name: Run Build
       run: npx lerna run build