diff --git a/.eslintrc.json b/.eslintrc.json
index 558fd928..7f52702c 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -84,14 +84,20 @@
     },
     "overrides": [
         {
-            "files": ["ext/mixed/js/core.js"],
+            "files": [
+                "ext/mixed/js/core.js",
+                "ext/bg/js/template-renderer.js"
+            ],
             "env": {
                 "webextensions": false
             }
         },
         {
             "files": ["ext/**/*.js"],
-            "excludedFiles": ["ext/mixed/js/core.js"],
+            "excludedFiles": [
+                "ext/mixed/js/core.js",
+                "ext/bg/js/template-renderer.js"
+            ],
             "globals": {
                 "errorToJson": "readonly",
                 "jsonToError": "readonly",
diff --git a/ext/bg/js/template-renderer.js b/ext/bg/js/template-renderer.js
index 1f68e3e0..5dd33814 100644
--- a/ext/bg/js/template-renderer.js
+++ b/ext/bg/js/template-renderer.js
@@ -43,7 +43,7 @@ class TemplateRenderer {
         }
 
         const markerPre = data.marker;
-        const markerPreHas = hasOwn(data, 'marker');
+        const markerPreHas = Object.prototype.hasOwnProperty.call(data, 'marker');
         try {
             this._stateStack = [new Map()];
             data.marker = marker;