diff --git a/source/util/src/tpagedbuf.c b/source/util/src/tpagedbuf.c
index 05264338a648a43ab74dc70a62c3d55019c322c4..17eb46059a8a4d093a932eb7129d957bd4495310 100644
--- a/source/util/src/tpagedbuf.c
+++ b/source/util/src/tpagedbuf.c
@@ -206,11 +206,11 @@ static char* doFlushBufPage(SDiskbasedBuf* pBuf, SPageInfo* pg) {
   }
 
   char* pDataBuf = pg->pData;
-  memset(pDataBuf, 0, getAllocPageSize(pBuf->pageSize));
-
   uDebug("page_flush %p, pageId:%d, offset:%ld, len: %d", pDataBuf, pg->pageId, offset, size);
   if (t && size == 4100) uDebug("page_flush, first 4 bytes: %d", *((int32_t*)t));
 
+  memset(pDataBuf, 0, getAllocPageSize(pBuf->pageSize));
+
   pg->offset = offset;
   pg->length = size;  // on disk size
   return pDataBuf;