diff --git a/source/libs/scalar/src/sclfunc.c b/source/libs/scalar/src/sclfunc.c
index 339065633bce5107df2879d45fbf259609a544a6..c20ff06c160f6620c6d3bf0cc6c1bd205fd55e12 100644
--- a/source/libs/scalar/src/sclfunc.c
+++ b/source/libs/scalar/src/sclfunc.c
@@ -1420,7 +1420,7 @@ int32_t timeDiffFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *p
         } else if (tsDigits == TSDB_TIME_PRECISION_MICRO_DIGITS) {
           timeVal[k] = timeVal[k] * 1000;
         } else if (tsDigits == TSDB_TIME_PRECISION_NANO_DIGITS) {
-          timeVal[k] = timeVal[k];
+          timeVal[k] = timeVal[k] * 1;
         } else {
           hasNull = true;
           break;