diff --git a/source/libs/executor/src/timewindowoperator.c b/source/libs/executor/src/timewindowoperator.c
index 4cbe9e467f..1eee2c197e 100644
--- a/source/libs/executor/src/timewindowoperator.c
+++ b/source/libs/executor/src/timewindowoperator.c
@@ -2291,6 +2291,10 @@ static SSDataBlock* doTimeslice(SOperatorInfo* pOperator) {
           break;
         }
       } else if (ts < pSliceInfo->current) {
+        //in case interpolation window starts and ends between two datapoints, fill(prev) need to interpolate
+        doKeepPrevRows(pSliceInfo, pBlock, i);
+        isPrevRowSet = true;
+
         if (i < pBlock->info.rows - 1) {
           int64_t nextTs = *(int64_t*)colDataGetData(pTsCol, i + 1);
           if (nextTs > pSliceInfo->current) {