diff --git a/src/jrd/lck.cpp b/src/jrd/lck.cpp
index c600917848..be17013b5b 100644
--- a/src/jrd/lck.cpp
+++ b/src/jrd/lck.cpp
@@ -513,7 +513,6 @@ static SLONG get_owner_handle(thread_db* tdbb, enum lck_t lock_type)
 	case LCK_database:
 	case LCK_bdb:
 	case LCK_shadow:
-	case LCK_retaining:
 	case LCK_backup_alloc:
 	case LCK_backup_database:
 	case LCK_monitor:
diff --git a/src/jrd/lck.h b/src/jrd/lck.h
index cb8533be88..f6216d832b 100644
--- a/src/jrd/lck.h
+++ b/src/jrd/lck.h
@@ -50,7 +50,6 @@ enum lck_t {
 	LCK_attachment,				// Attachment lock
 	LCK_shadow,					// Lock to synchronize addition of shadows
 	LCK_sweep,					// Sweep lock for single sweeper
-	LCK_retaining,				// Youngest commit retaining transaction
 	LCK_expression,				// Expression index caching mechanism
 	LCK_prc_exist,				// Procedure existence lock
 	LCK_update_shadow,			// shadow update sync lock