diff --git a/libraries/tcpdf/tcpdf.php b/libraries/tcpdf/tcpdf.php
index 3d134b61d..a6b707ac2 100644
--- a/libraries/tcpdf/tcpdf.php
+++ b/libraries/tcpdf/tcpdf.php
@@ -2996,7 +2996,7 @@ if(!class_exists('TCPDF', false)) {
 				case 'D': {
 					//Download file
 					if(ob_get_contents()) {
-						$this->Error(ob_get_contents().'Some data has already been output, can\'t send PDF file');
+						$this->Error('Some data has already been output, can\'t send PDF file');
 					}
 					
 					if(isset($_SERVER['HTTP_USER_AGENT']) && strpos($_SERVER['HTTP_USER_AGENT'],'MSIE')) {
@@ -3007,6 +3007,7 @@ if(!class_exists('TCPDF', false)) {
 					if(headers_sent()) {
 						$this->Error('Some data has already been output to browser, can\'t send PDF file');
 					}
+					header('Content-Type: application/pdf');
 					header('Content-Length: '.strlen($this->buffer));
 					header('Content-disposition: attachment; filename="'.$name.'"');
 					echo $this->buffer;