diff --git a/src/client/src/tscGlobalmerge.c b/src/client/src/tscGlobalmerge.c
index 130abdf4a73ade3951070a100555d15270c265f2..1db6017add976463761f08bd81ab4fb66bb0c710 100644
--- a/src/client/src/tscGlobalmerge.c
+++ b/src/client/src/tscGlobalmerge.c
@@ -967,7 +967,7 @@ SSDataBlock* doGlobalAggregate(void* param, bool* newgroup) {
 
       if (pOperator->pRuntimeEnv->pQueryAttr->order.order == TSDB_ORDER_DESC) {
         SWAP(w->skey, w->ekey, TSKEY);
-        assert(w->skey <= w->ekey);
+        assert(w->skey >= w->ekey);
       }
     }
   }