diff --git a/src/midend/SysYIRGenerator.cpp b/src/midend/SysYIRGenerator.cpp
index b84461d..cd0ac3c 100644
--- a/src/midend/SysYIRGenerator.cpp
+++ b/src/midend/SysYIRGenerator.cpp
@@ -895,7 +895,7 @@ std::any SysYIRGenerator::visitFuncDef(SysYParser::FuncDefContext *ctx){
         currentParamDims.push_back(ConstantInteger::get(-1)); // 标记第一个维度为未知
         for (const auto &exp : param->exp()) {
           // 访问表达式以获取维度大小，这些维度必须是常量
-          Value* dimVal = std::any_cast<Value *>(visitExp(exp));
+          Value* dimVal = computeExp(exp);
           // 确保维度是常量整数，否则 buildArrayType 会断言失败
           assert(dynamic_cast<ConstantInteger*>(dimVal) && "Array dimension in parameter must be a constant integer!");
           currentParamDims.push_back(dimVal);