diff --git a/src/backend/storage/freespace/freespace.c b/src/backend/storage/freespace/freespace.c
index 4773a9cc65e6..a6479977c6d5 100644
--- a/src/backend/storage/freespace/freespace.c
+++ b/src/backend/storage/freespace/freespace.c
@@ -614,7 +614,10 @@ fsm_readbuf(Relation rel, FSMAddress addr, bool extend)
 	{
 		LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
 		if (PageIsNew(BufferGetPage(buf)))
+		{
 			PageInit(BufferGetPage(buf), BLCKSZ, 0);
+			MarkBufferDirty(buf);
+		}
 		LockBuffer(buf, BUFFER_LOCK_UNLOCK);
 	}
 	return buf;