diff --git a/src/query/src/qResultbuf.c b/src/query/src/qResultbuf.c
index f2194bbfb510c0d654963358c44c4255d8d95f29..0eefb106b93149a16a3fdd1f1686533066a2793e 100644
--- a/src/query/src/qResultbuf.c
+++ b/src/query/src/qResultbuf.c
@@ -207,7 +207,8 @@ void destroyResultBuf(SDiskbasedResultBuf* pResultBuf, void* handle) {
 
   taosArrayDestroy(pResultBuf->list);
   taosHashCleanup(pResultBuf->idsTable);
-  
+
+  tfree(pResultBuf->iBuf);
   tfree(pResultBuf);
 }