diff --git a/weed/filesys/page_writer/page_chunk_swapfile.go b/weed/filesys/page_writer/page_chunk_swapfile.go
index c4bd801cc..44ad64297 100644
--- a/weed/filesys/page_writer/page_chunk_swapfile.go
+++ b/weed/filesys/page_writer/page_chunk_swapfile.go
@@ -113,4 +113,5 @@ func (sc *SwapFileChunk) SaveContent(saveFn SaveToStorageFunc) {
 		})
 		mem.Free(data)
 	}
+	sc.usage = newChunkWrittenIntervalList()
 }