diff --git a/src/backend/storage/lmgr/lwlock.c b/src/backend/storage/lmgr/lwlock.c
index 315a78cda9..263b483251 100644
--- a/src/backend/storage/lmgr/lwlock.c
+++ b/src/backend/storage/lmgr/lwlock.c
@@ -599,6 +599,8 @@ GetNamedLWLockTranche(const char *tranche_name)
 	int			lock_pos;
 	int			i;
 
+	Assert(LWLockHeldByMeInMode(AddinShmemInitLock, LW_EXCLUSIVE));
+
 	/*
 	 * Obtain the position of base address of LWLock belonging to requested
 	 * tranche_name in MainLWLockArray.  LWLocks for named tranches are placed