diff --git a/app/javascript/mastodon/components/autosuggest_textarea.js b/app/javascript/mastodon/components/autosuggest_textarea.js
index 35b37600fe540..30e3049dfff28 100644
--- a/app/javascript/mastodon/components/autosuggest_textarea.js
+++ b/app/javascript/mastodon/components/autosuggest_textarea.js
@@ -128,7 +128,7 @@ export default class AutosuggestTextarea extends ImmutablePureComponent {
   }
 
   onSuggestionClick = (e) => {
-    const suggestion = Number(e.currentTarget.getAttribute('data-index'));
+    const suggestion = e.currentTarget.getAttribute('data-index');
     e.preventDefault();
     this.props.onSuggestionSelected(this.state.tokenStart, this.state.lastToken, suggestion);
     this.textarea.focus();
diff --git a/app/javascript/mastodon/features/compose/components/upload_form.js b/app/javascript/mastodon/features/compose/components/upload_form.js
index 78473dab40e06..cf2d2658aeff7 100644
--- a/app/javascript/mastodon/features/compose/components/upload_form.js
+++ b/app/javascript/mastodon/features/compose/components/upload_form.js
@@ -21,7 +21,7 @@ export default class UploadForm extends React.PureComponent {
   };
 
   onRemoveFile = (e) => {
-    const id = Number(e.currentTarget.parentElement.getAttribute('data-id'));
+    const id = e.currentTarget.parentElement.getAttribute('data-id');
     this.props.onRemoveFile(id);
   }