diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/MergeAggregate.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/MergeAggregate.java
index a2c23dd9b412b0..8ea8a7f217dbc3 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/MergeAggregate.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/MergeAggregate.java
@@ -146,7 +146,7 @@ boolean commonCheck(LogicalAggregate<? extends Plan> outerAgg, LogicalAggregate<
                         (existValue, newValue) -> existValue));
         Set<AggregateFunction> aggregateFunctions = outerAgg.getAggregateFunctions();
         List<AggregateFunction> replacedAggFunctions = projectOptional.map(project ->
-                (List<AggregateFunction>) PlanUtils.replaceExpressionByProjections(
+                (List<AggregateFunction>) (List) PlanUtils.replaceExpressionByProjections(
                 projectOptional.get().getProjects(), new ArrayList<>(aggregateFunctions)))
                 .orElse(new ArrayList<>(aggregateFunctions));
         for (AggregateFunction outerFunc : replacedAggFunctions) {