diff --git a/.eslintrc.js b/.eslintrc.js
index 2cda591..7ca2959 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -5,6 +5,7 @@ module.exports = {
     browser: true
   },
   rules: {
+    'operator-assignment': ['error', 'never'],
     'no-multiple-empty-lines': ['error', {max: 2}],
     'arrow-parens': ['error', 'as-needed'],
     'comma-dangle': ['error', 'never'],