diff --git a/quickbase.php b/quickbase.php
index 3be0693..9a2c84b 100644
--- a/quickbase.php
+++ b/quickbase.php
@@ -59,7 +59,7 @@ public function __construct($un, $pw, $user_token='', $usexml = true, $db = '',
 		}		
 		$this->xml = $usexml;
 		
-		if ($this->username)
+		if ($this->user_name)
 		{
             $uid = $this->authenticate();
         
@@ -1113,4 +1113,4 @@ public function api_run_import($id) {
 		return false;
 	}
 }
-?>
\ No newline at end of file
+?>