diff --git a/source/dnode/mnode/impl/src/mndStreamTrans.c b/source/dnode/mnode/impl/src/mndStreamTrans.c
index c16016cf13..7171d44da4 100644
--- a/source/dnode/mnode/impl/src/mndStreamTrans.c
+++ b/source/dnode/mnode/impl/src/mndStreamTrans.c
@@ -324,7 +324,7 @@ void killAllCheckpointTrans(SMnode *pMnode, SVgroupChangeInfo *pChangeInfo) {
 
     size_t len = 0;
     void  *pKey = taosHashGetKey(pDb, &len);
-    stpncpy(p, pKey, 127);
+    tstrncpy(p, pKey, 128);
 
     int32_t code = doKillCheckpointTrans(pMnode, pKey, len);
     if (code) {
diff --git a/source/os/src/osString.c b/source/os/src/osString.c
index 28ea46ba1a..d265ed510a 100644
--- a/source/os/src/osString.c
+++ b/source/os/src/osString.c
@@ -87,18 +87,18 @@ char *stpncpy(char *dest, const char *src, int n) {
   if (size == n) return dest;
   return memset(dest, '\0', n - size);
 }
-#endif
-
+#else
 char *taosStrndup(const char *s, int size) {
   if (s == NULL) {
     return NULL;
   }
-  char* p = strndup(s, size);
+  char *p = strndup(s, size);
   if (NULL == p) {
     terrno = TSDB_CODE_OUT_OF_MEMORY;
   }
   return p;
 }
+#endif
 
 int32_t taosStr2int64(const char *str, int64_t *val) {
   if (str == NULL || val == NULL) {