diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index 6ded968e163..027a59a68ca 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -469,7 +469,7 @@ GetPrivateRefCountEntrySlow(Buffer buffer, bool do_move)
 		free->data = res->data;
 		PrivateRefCountArrayKeys[ReservedRefCountSlot] = buffer;
 		/* update cache for the next lookup */
-		PrivateRefCountEntryLast = match;
+		PrivateRefCountEntryLast = ReservedRefCountSlot;
 
 		ReservedRefCountSlot = -1;