diff --git a/app/javascript/mastodon/components/autosuggest_input.jsx b/app/javascript/mastodon/components/autosuggest_input.jsx
index 267c0442158..f059356f09c 100644
--- a/app/javascript/mastodon/components/autosuggest_input.jsx
+++ b/app/javascript/mastodon/components/autosuggest_input.jsx
@@ -28,7 +28,7 @@ const textAtCursorMatchesToken = (str, caretPosition, searchTokens) => {
     return [null, null];
   }
 
-  word = word.trim().toLowerCase();
+  word = word.trim();
 
   if (word.length > 0) {
     return [left + 1, word];
diff --git a/app/javascript/mastodon/components/autosuggest_textarea.jsx b/app/javascript/mastodon/components/autosuggest_textarea.jsx
index a9acc87252d..fae078da31b 100644
--- a/app/javascript/mastodon/components/autosuggest_textarea.jsx
+++ b/app/javascript/mastodon/components/autosuggest_textarea.jsx
@@ -29,7 +29,7 @@ const textAtCursorMatchesToken = (str, caretPosition) => {
     return [null, null];
   }
 
-  word = word.trim().toLowerCase();
+  word = word.trim();
 
   if (word.length > 0) {
     return [left + 1, word];