diff --git a/public/language/en-US/error.json b/public/language/en-US/error.json
index f12e15c94f..ae9a6eb41d 100644
--- a/public/language/en-US/error.json
+++ b/public/language/en-US/error.json
@@ -31,7 +31,7 @@
     "invalid-path": "Invalid path",
     "folder-exists": "Folder exists",
     "invalid-pagination-value": "Invalid pagination value, must be at least %1 and at most %2",
-    "username-taken": "Username taken",
+    "username-taken": "Username taken.",
     "email-taken": "Email address is already taken.",
     "email-nochange": "The email entered is the same as the email already on file.",
     "email-invited": "Email was already invited",
diff --git a/public/src/client/register.js b/public/src/client/register.js
index d8144d26d5..403f995dad 100644
--- a/public/src/client/register.js
+++ b/public/src/client/register.js
@@ -126,7 +126,7 @@ define('forum/register', [
 		} else if (username.length > ajaxify.data.maximumUsernameLength) {
 			showError(usernameInput, username_notify, '[[error:username-too-long]]');
 		} else if (!utils.isUserNameValid(username) || !userslug) {
-			showError(usernameInput, username_notify, '[[error:invalid-username]]');
+			showError(usernameInput, username_notify, '[[error:username-taken]]');
 		} else {
 			Promise.allSettled([
 				api.head(`/users/bySlug/${userslug}`, {}),
@@ -135,9 +135,8 @@ define('forum/register', [
 				if (results.every(obj => obj.status === 'rejected')) {
 					showSuccess(usernameInput, username_notify, successIcon);
 				} else {
-					showError(usernameInput, username_notify, '[[error:username-taken]]');
+					showError(usernameInput, username_notify,`[[error:username-taken]] Maybe try ${usernameInput.val()}suffix`);
 				}
-
 				callback();
 			});
 		}