diff --git a/its-fps-qrcodedata-class.php b/its-fps-qrcodedata-class.php
index a959e63..ff2f694 100644
--- a/its-fps-qrcodedata-class.php
+++ b/its-fps-qrcodedata-class.php
@@ -15,7 +15,7 @@ if( !class_exists('ITS_FPS_QRCodeData') ){
         public function getDataString(){
             $msg = $this->emvString($this->data);
             $crc = $this->pad(dechex($this->crc16ccitt($msg)),4);
-            return $msg . $crc;
+            return $msg . strtoupper($crc);
         }
     
         private function pad($s, $size = 2) {
@@ -146,4 +146,4 @@ if( !class_exists('ITS_FPS_QRCodeData') ){
     }
 }
 
-?>
\ No newline at end of file
+?>