diff --git a/lib/hdb/hdb_err.et b/lib/hdb/hdb_err.et
index 26d0205ba..8c6cc0f1c 100644
--- a/lib/hdb/hdb_err.et
+++ b/lib/hdb/hdb_err.et
@@ -22,5 +22,6 @@ error_code BADLOCKMODE,		"Invalid kdb lock mode"
 error_code CANT_LOCK_DB,	"Insufficient access to lock database"
 error_code EXISTS,		"Entry already exists in database"
 error_code BADVERSION,		"Wrong database version"
+error_code NO_MKEY,		"No correct master key"
 
 end