diff --git a/packages/eslint-config-airbnb-base/rules/best-practices.js b/packages/eslint-config-airbnb-base/rules/best-practices.js
index 978cafc6..b5712d00 100644
--- a/packages/eslint-config-airbnb-base/rules/best-practices.js
+++ b/packages/eslint-config-airbnb-base/rules/best-practices.js
@@ -173,6 +173,7 @@ module.exports = {
       props: true,
       ignorePropertyModificationsFor: [
         'acc', // for reduce accumulators
+        'accumulator', // for reduce accumulators
         'e', // for e.returnvalue
         'ctx', // for Koa routing
         'req', // for Express requests