diff --git a/casadm/extended_err_msg.c b/casadm/extended_err_msg.c
index 18354a4..7fecbc1 100644
--- a/casadm/extended_err_msg.c
+++ b/casadm/extended_err_msg.c
@@ -158,6 +158,10 @@ struct {
 		OCF_ERR_INVAL_CACHE_DEV,
 		"Device does not meet requirements."
 	},
+	{
+		OCF_ERR_NO_LOCK,
+		"Failed to lock cache for management operation."
+	},
 
 	/* CAS kernel error mappings*/
 	{