diff --git a/.eslintrc.js b/.eslintrc.js
index 03af2975b..e728a7f14 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -81,7 +81,6 @@ module.exports = {
     ],
     'no-empty': 'off',
     'no-nested-ternary': 'warn',
-    'no-prototype-builtins': 'off',
     'no-restricted-properties': [
       'error',
       { property: 'substring', message: 'Use .slice instead of .substring.' },
diff --git a/app/javascript/mastodon/features/emoji/emoji_utils.js b/app/javascript/mastodon/features/emoji/emoji_utils.js
index dbf725c1f..571907a50 100644
--- a/app/javascript/mastodon/features/emoji/emoji_utils.js
+++ b/app/javascript/mastodon/features/emoji/emoji_utils.js
@@ -135,19 +135,19 @@ function getData(emoji, skin, set) {
       }
     }
 
-    if (data.short_names.hasOwnProperty(emoji)) {
+    if (Object.prototype.hasOwnProperty.call(data.short_names, emoji)) {
       emoji = data.short_names[emoji];
     }
 
-    if (data.emojis.hasOwnProperty(emoji)) {
+    if (Object.prototype.hasOwnProperty.call(data.emojis, emoji)) {
       emojiData = data.emojis[emoji];
     }
   } else if (emoji.id) {
-    if (data.short_names.hasOwnProperty(emoji.id)) {
+    if (Object.prototype.hasOwnProperty.call(data.short_names, emoji.id)) {
       emoji.id = data.short_names[emoji.id];
     }
 
-    if (data.emojis.hasOwnProperty(emoji.id)) {
+    if (Object.prototype.hasOwnProperty.call(data.emojis, emoji.id)) {
       emojiData = data.emojis[emoji.id];
       skin = skin || emoji.skin;
     }
@@ -216,7 +216,7 @@ function deepMerge(a, b) {
     let originalValue = a[key],
       value = originalValue;
 
-    if (b.hasOwnProperty(key)) {
+    if (Object.prototype.hasOwnProperty.call(b, key)) {
       value = b[key];
     }