diff --git a/modules/authorizeaim/authorizeaim.php b/modules/authorizeaim/authorizeaim.php
index 419796c1c..7ddcd706c 100755
--- a/modules/authorizeaim/authorizeaim.php
+++ b/modules/authorizeaim/authorizeaim.php
@@ -220,7 +220,7 @@ class authorizeAIM extends PaymentModule
 		$pcc->transaction_id = (string)$response[6];
 		
 		// 50 => Card number (XXXX0000)
-		$pcc->card_number = (string)$response[50];
+		$pcc->card_number = (string)substr($response[50], -4);
 		
 		// 51 => Card Mark (Visa, Master card)
 		$pcc->card_brand = (string)$response[51];