diff --git a/source/libs/tfs/src/tfs.c b/source/libs/tfs/src/tfs.c
index 0054a94b80..92beeffa0c 100644
--- a/source/libs/tfs/src/tfs.c
+++ b/source/libs/tfs/src/tfs.c
@@ -161,10 +161,12 @@ bool tfsIsSameFile(const STfsFile *pFile1, const STfsFile *pFile2) {
   if (pFile1->did.level != pFile2->did.level) return false;
   if (pFile1->did.id != pFile2->did.id) return false;
   char nameBuf1[TMPNAME_LEN], nameBuf2[TMPNAME_LEN];
-  memset(nameBuf1, 0, TMPNAME_LEN);
-  memset(nameBuf2, 0, TMPNAME_LEN);
-  taosRealPath(pFile1->rname, nameBuf1, TMPNAME_LEN);
-  taosRealPath(pFile2->rname, nameBuf2, TMPNAME_LEN);
+  strncpy(nameBuf1, pFile1->rname, TMPNAME_LEN);
+  strncpy(nameBuf2, pFile2->rname, TMPNAME_LEN);
+  nameBuf1[TMPNAME_LEN - 1] = 0;
+  nameBuf2[TMPNAME_LEN - 1] = 0;
+  taosRealPath(nameBuf1, NULL, TMPNAME_LEN);
+  taosRealPath(nameBuf2, NULL, TMPNAME_LEN);
   if (strncmp(nameBuf1, nameBuf2, TMPNAME_LEN) != 0) return false;
   return true;
 }