diff --git a/.github/workflows/quality-checks.yml b/.github/workflows/quality-checks.yml
index 83c1ca55..c2d98376 100644
--- a/.github/workflows/quality-checks.yml
+++ b/.github/workflows/quality-checks.yml
@@ -100,9 +100,26 @@ jobs:
             echo "frontend_changed=true" >> $GITHUB_OUTPUT
             exit 0
           fi
+          # Try to fetch the PR base ref. This may fail for forked PRs or other cases.
           git fetch origin ${{ github.event.pull_request.base.ref }} --depth=1 || true
-          CHANGED=$(git diff --name-only origin/${{ github.event.pull_request.base.ref }}...HEAD || true)
-          echo "Changed files:\n$CHANGED"
+
+          # Compute changed files against the PR base ref, fallback to origin/main, then fallback to last 10 commits
+          CHANGED=$(git diff --name-only origin/${{ github.event.pull_request.base.ref }}...HEAD 2>/dev/null || echo "")
+          echo "Changed files (base ref):\n$CHANGED"
+
+          if [ -z "$CHANGED" ]; then
+            echo "Base ref diff empty or failed; fetching origin/main for fallback..."
+            git fetch origin main --depth=1 || true
+            CHANGED=$(git diff --name-only origin/main...HEAD 2>/dev/null || echo "")
+            echo "Changed files (main fallback):\n$CHANGED"
+          fi
+
+          if [ -z "$CHANGED" ]; then
+            echo "Still empty; falling back to diffing last 10 commits from HEAD..."
+            CHANGED=$(git diff --name-only HEAD~10...HEAD 2>/dev/null || echo "")
+            echo "Changed files (HEAD~10 fallback):\n$CHANGED"
+          fi
+
           if echo "$CHANGED" | grep -q '^frontend/'; then
             echo "frontend_changed=true" >> $GITHUB_OUTPUT
           else