diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index e82093d07e..8a2e118fe7 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -5634,7 +5634,7 @@ int32_t blockDistFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
   double factor = pData->numOfBlocks / 80.0;
 
   int32_t numOfBuckets = sizeof(pData->blockRowsHisto) / sizeof(pData->blockRowsHisto[0]);
-  int32_t bucketRange = (pData->defMaxRows - pData->defMinRows) / numOfBuckets;
+  int32_t bucketRange = ceil(((double) (pData->defMaxRows - pData->defMinRows)) / numOfBuckets);
 
   for (int32_t i = 0; i < tListLen(pData->blockRowsHisto); ++i) {
     len = sprintf(st + VARSTR_HEADER_SIZE, "%04d |", pData->defMinRows + bucketRange * (i + 1));