diff --git a/src/backend/access/gin/gininsert.c b/src/backend/access/gin/gininsert.c
index 370884e..229167b 100644
--- a/src/backend/access/gin/gininsert.c
+++ b/src/backend/access/gin/gininsert.c
@@ -191,6 +191,7 @@ ginEntryInsert(GinState *ginstate,
 		buildStats->nEntries++;
 
 	ginPrepareEntryScan(&btree, attnum, key, category, ginstate);
+	btree.isBuild = (buildStats != NULL);
 
 	stack = ginFindLeafPage(&btree, false);
 	page = BufferGetPage(stack->buffer);