diff --git a/remsim/RSPRO.asn b/remsim/RSPRO.asn
index faf9cec..5e2c05b 100644
--- a/remsim/RSPRO.asn
+++ b/remsim/RSPRO.asn
@@ -87,6 +87,7 @@
 	illegalSlotId			(3),
 	unsupportedProtocolVersion	(4),
 	unknownSlotmap			(5),
+	identityInUse			(6),
 
 	-- no card is present in given slot
 	cardNotPresent			(100),