diff --git a/src/util/src/tlog.c b/src/util/src/tlog.c
index 933a65131b62bf81655be59099755294bcaad694..9770da49acf70fdc339ee5b6497ac213602e3f76 100644
--- a/src/util/src/tlog.c
+++ b/src/util/src/tlog.c
@@ -574,7 +574,7 @@ static int32_t taosPushLogBuffer(SLogBuff *tLogBuff, char *msg, int32_t msgLen)
 
   if (lostLine > 0) {
     sprintf(tmpBuf, "...Lost %"PRId64" lines here...\n", lostLine);
-    tmpBufLen = strlen(tmpBuf);
+    tmpBufLen = (int32_t)strlen(tmpBuf);
   }
 
   if (remainSize <= msgLen || ((lostLine > 0) && (remainSize <= (msgLen + tmpBufLen)))) {