diff --git a/public/language/en-GB/error.json b/public/language/en-GB/error.json
index b32ccfedfb..8c8c81f918 100644
--- a/public/language/en-GB/error.json
+++ b/public/language/en-GB/error.json
@@ -18,7 +18,7 @@
 	"invalid-mid": "Invalid Chat Message ID",
 	"invalid-date": "A valid date must be provided",
 
-	"invalid-username": "Invalid Username",
+	"invalid-username": "Invalid Username. Maybe try %1",
 	"invalid-email": "Invalid Email",
 	"invalid-fullname": "Invalid Fullname",
 	"invalid-location": "Invalid Location",
diff --git a/public/language/en-US/error.json b/public/language/en-US/error.json
index ea28a9a51c..b34c1c3b5c 100644
--- a/public/language/en-US/error.json
+++ b/public/language/en-US/error.json
@@ -32,7 +32,7 @@
     "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. Maybe try %1",
     "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 f989901e7b..42ce0ea09a 100644
--- a/public/src/client/register.js
+++ b/public/src/client/register.js
@@ -135,8 +135,7 @@ 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, ${username}suffix]]`);				}
 
 				callback();
 			});