diff --git a/src/client/src/tscParseInsert.c b/src/client/src/tscParseInsert.c
index 2b962333d588117ba54f363b7da586b6f04e3d47..103cc067b138b413042d45de196e2ddb1aee7cf9 100644
--- a/src/client/src/tscParseInsert.c
+++ b/src/client/src/tscParseInsert.c
@@ -117,7 +117,7 @@ int tsParseTime(SStrToken *pToken, int64_t *time, char **next, char *error, int1
     if (sToken.type == TK_PLUS) {
       useconds += interval;
     } else {
-      useconds = (useconds >= interval) ? useconds - interval : 0;
+      useconds = useconds - interval;
     }
 
     *next = pTokenEnd;