diff --git a/src/plugins/http/src/httpJson.c b/src/plugins/http/src/httpJson.c
index 4bd66a17a3ed3c9f6ba042c8ad96d0ffdfcafb5d..3c72b795eef69186ef4e6308937678589224c60d 100644
--- a/src/plugins/http/src/httpJson.c
+++ b/src/plugins/http/src/httpJson.c
@@ -268,7 +268,7 @@ void httpJsonTimestamp(JsonBuf* buf, int64_t t, int32_t timePrecision) {
   int32_t fractionLen;
   char* format = NULL;
   time_t quot = 0;
-  long mod = 0;
+  int64_t mod = 0;
 
   switch (timePrecision) {
     case TSDB_TIME_PRECISION_MILLI: {