diff --git a/src/components/output/custom-els/MultiPanel/index.ts b/src/components/output/custom-els/MultiPanel/index.ts
index 882c327d..95a06dcd 100644
--- a/src/components/output/custom-els/MultiPanel/index.ts
+++ b/src/components/output/custom-els/MultiPanel/index.ts
@@ -43,7 +43,7 @@ export default class MultiPanel extends HTMLElement {
   private _onKeyDown(event: KeyboardEvent) {
     const selectedEl = document.activeElement;
     const heading = getClosestHeading(selectedEl);
-    
+
     // if keydown event is not on heading element, ignore
     if (!heading) return;
 
diff --git a/tslint.json b/tslint.json
index 75c31656..e2eeef2c 100644
--- a/tslint.json
+++ b/tslint.json
@@ -11,6 +11,7 @@
     "function-name": false,
     "variable-name": [true, "check-format", "allow-leading-underscore"],
     "no-duplicate-imports": false,
+    "prefer-template": [true, "allow-single-concat"],
     "import-name": false
   },
   "linterOptions": {