diff --git a/src/tsdb/src/tsdbFS.c b/src/tsdb/src/tsdbFS.c
index 51c5a92edd2a33a8b6f2e56c02ce8ae53740068a..700d60546886ecff3d0ecf614bd54b521d8b9414 100644
--- a/src/tsdb/src/tsdbFS.c
+++ b/src/tsdb/src/tsdbFS.c
@@ -541,7 +541,7 @@ SDFileSet *tsdbFSIterNext(SFSIter *pIter) {
     pIter->index--;
   }
 
-  if (pIter->index > 0) {
+  if (pIter->index >= 0) {
     pIter->fid = ((SDFileSet *)taosArrayGet(pfs->cstatus->df, pIter->index))->fid;
   } else {
     pIter->fid = TSDB_IVLD_FID;