diff --git a/armsrc/appmain.c b/armsrc/appmain.c
index f5989bd64..68b285837 100644
--- a/armsrc/appmain.c
+++ b/armsrc/appmain.c
@@ -920,7 +920,7 @@ void UsbPacketReceived(uint8_t *packet, int len)
 			break;
 
 		case CMD_MIFARE_COLLECT_NONCES:
-			MifareCollectNonces(c->arg[0], c->[1]);
+			MifareCollectNonces(c->arg[0], c->arg[1]);
 			break;
 #endif