diff --git a/.mokogitea/workflows/pr-check.yml b/.mokogitea/workflows/pr-check.yml
index e2c82ef..0ac0ef1 100644
--- a/.mokogitea/workflows/pr-check.yml
+++ b/.mokogitea/workflows/pr-check.yml
@@ -105,6 +105,19 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Check for merge conflict markers
+        run: |
+          CONFLICTS=$(grep -rn '<<<<<<< \|>>>>>>> \|^=======$' --include='*.php' --include='*.xml' --include='*.css' --include='*.js' --include='*.json' --include='*.md' --include='*.yml' --include='*.yaml' --include='*.ini' --include='*.txt' . 2>/dev/null | grep -v '.git/' || true)
+          if [ -n "$CONFLICTS" ]; then
+            echo "::error::Merge conflict markers found in source files"
+            echo "## Conflict Markers Found" >> $GITHUB_STEP_SUMMARY
+            echo '```' >> $GITHUB_STEP_SUMMARY
+            echo "$CONFLICTS" >> $GITHUB_STEP_SUMMARY
+            echo '```' >> $GITHUB_STEP_SUMMARY
+            exit 1
+          fi
+          echo "No conflict markers found"
+
       - name: Detect platform
         id: platform
         run: |