diff --git a/src/ir/IRBuilder.cpp b/src/ir/IRBuilder.cpp
index 4987681..f7f2c30 100644
--- a/src/ir/IRBuilder.cpp
+++ b/src/ir/IRBuilder.cpp
@@ -218,6 +218,11 @@ static std::shared_ptr<Type> ResolveGepResultType(const std::shared_ptr<Type>& b
   }
   auto cur = base_ptr_ty->GetElementType();
   for (size_t i = 0; i < index_count; ++i) {
+    // LLVM GEP 的第一个索引只是在当前 pointee 对象上做寻址，
+    // 不会立刻深入到数组元素类型；真正进入聚合类型从第二个索引开始。
+    if (i == 0) {
+      continue;
+    }
     if (cur->IsArray()) {
       cur = cur->GetElementType();
       continue;
diff --git a/src/irgen/IRGenExp.cpp b/src/irgen/IRGenExp.cpp
index 9a67446..27f2498 100644
--- a/src/irgen/IRGenExp.cpp
+++ b/src/irgen/IRGenExp.cpp
@@ -137,7 +137,8 @@ std::any IRGenImpl::visitUnaryExp(SysYParser::UnaryExpContext* ctx) {
             auto* arg_elem = arg->GetType()->GetElementType().get();
             if (param_elem && arg_elem && arg_elem->IsArray() &&
                 arg_elem->GetElementType()->Equals(*param_elem)) {
-              std::vector<ir::Value*> idx = {builder_.CreateConstInt(0)};
+              std::vector<ir::Value*> idx = {builder_.CreateConstInt(0),
+                                             builder_.CreateConstInt(0)};
               args[i] = builder_.CreateGep(arg, std::move(idx),
                                            module_.GetContext().NextTemp());
               arg = args[i];