diff --git a/src/query/src/qTsbuf.c b/src/query/src/qTsbuf.c
index 4c1a2310ff9270b71e46478ed4514a2164da7bad..b80cd5ca5f594824196a8d13e44d60710e7ecbe5 100644
--- a/src/query/src/qTsbuf.c
+++ b/src/query/src/qTsbuf.c
@@ -269,7 +269,7 @@ static void writeDataToDisk(STSBuf* pTSBuf) {
     metaLen += (int32_t)fwrite(pBlock->tag.pz, 1, (size_t)pBlock->tag.nLen, pTSBuf->f);
   } else if (pBlock->tag.nType == TSDB_DATA_TYPE_FLOAT) {
     metaLen += (int32_t)fwrite(&pBlock->tag.nLen, 1, sizeof(pBlock->tag.nLen), pTSBuf->f);
-    float tfloat = pBlock->tag.dKey;
+    float tfloat = (float)pBlock->tag.dKey;
     metaLen += (int32_t)fwrite(&tfloat, 1, (size_t) pBlock->tag.nLen, pTSBuf->f);  
   } else if (pBlock->tag.nType != TSDB_DATA_TYPE_NULL) {
     metaLen += (int32_t)fwrite(&pBlock->tag.nLen, 1, sizeof(pBlock->tag.nLen), pTSBuf->f);
@@ -358,7 +358,7 @@ STSBlock* readDataFromDisk(STSBuf* pTSBuf, int32_t order, bool decomp) {
   } else if (pBlock->tag.nType == TSDB_DATA_TYPE_FLOAT) {
     float tfloat = 0;
     sz = fread(&tfloat, (size_t) pBlock->tag.nLen, 1, pTSBuf->f);
-    pBlock->tag.dKey = tfloat;
+    pBlock->tag.dKey = (double)tfloat;
     UNUSED(sz);
   } else if (pBlock->tag.nType != TSDB_DATA_TYPE_NULL) { //TODO check the return value
     sz = fread(&pBlock->tag.i64, (size_t) pBlock->tag.nLen, 1, pTSBuf->f);