diff --git a/src/usr/local/captiveportal/index.php b/src/usr/local/captiveportal/index.php
index b213d4b0c2..526b142532 100644
--- a/src/usr/local/captiveportal/index.php
+++ b/src/usr/local/captiveportal/index.php
@@ -189,11 +189,11 @@ EOD;
 			$passwd = $cpcfg['radmac_secret'];
 			$context = 'radmac'; // Radius MAC authentication
 		} elseif (!empty($_POST['auth_user2'])) { 
-			$user = $_POST['auth_user2'];
+			$user = trim($_POST['auth_user2']);
 			$passwd = $_POST['auth_pass2'];
 			$context = 'second'; // Assume users to use the first context if auth_user2 is empty/does not exist
 		} else {
-			$user = $_POST['auth_user'];
+			$user = trim($_POST['auth_user']);
 			$passwd = $_POST['auth_pass'];
 			$context = 'first';
 		}