diff --git a/src/system/detail/src/mgmtDnode.c b/src/system/detail/src/mgmtDnode.c
index 7b0bc22daf1e8c99b44e17352bfde18e190cb9e8..86550b46e7c95f9a34866820d31f85c195a85104 100644
--- a/src/system/detail/src/mgmtDnode.c
+++ b/src/system/detail/src/mgmtDnode.c
@@ -476,6 +476,8 @@ int mgmtRetrieveVnodes(SShowObj *pShow, char *data, int rows, SConnObj *pConn) {
           continue;
         }
         
+        cols = 0;
+        
         pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
         *(uint32_t *)pWrite = pVnode->vnode;
         cols++;