diff --git a/source/libs/tdb/src/db/tdbBtree.c b/source/libs/tdb/src/db/tdbBtree.c
index 5c34a8c23f..ff40616d70 100644
--- a/source/libs/tdb/src/db/tdbBtree.c
+++ b/source/libs/tdb/src/db/tdbBtree.c
@@ -1133,7 +1133,7 @@ static int tdbBtreeEncodePayload(SPage *pPage, SCell *pCell, int nHeader, const
 
       memcpy(pCell + nLocal - sizeof(pgno), &pgno, sizeof(pgno));
 
-      int lastKeyPageSpace = 0;
+      size_t lastKeyPageSpace = 0;
       // pack left key & val to ovpages
       do {
         // cal key to cpy