diff --git a/ets2panda/checker/ETSchecker.cpp b/ets2panda/checker/ETSchecker.cpp
index ce5dd58750cf2af73e27ba167dafc524205d481a..4a079d96cdb3f060f68f1c8d089e9219f67e71e5 100644
--- a/ets2panda/checker/ETSchecker.cpp
+++ b/ets2panda/checker/ETSchecker.cpp
@@ -97,13 +97,15 @@ static util::StringView InitBuiltin(ETSChecker *checker, std::string_view signat
     ES2PANDA_ASSERT(iterator != varMap.end());
     auto *var = iterator->second;
     Type *type {nullptr};
-    if (var->Declaration()->Node()->IsClassDefinition()) {
-        type = checker->BuildBasicClassProperties(var->Declaration()->Node()->AsClassDefinition());
-    } else {
-        ES2PANDA_ASSERT(var->Declaration()->Node()->IsTSInterfaceDeclaration());
-        type = checker->BuildBasicInterfaceProperties(var->Declaration()->Node()->AsTSInterfaceDeclaration());
+    if (var->HasFlag(varbinder::VariableFlags::BUILTIN_TYPE)) {
+        if (var->Declaration()->Node()->IsClassDefinition()) {
+            type = checker->BuildBasicClassProperties(var->Declaration()->Node()->AsClassDefinition());
+        } else {
+            ES2PANDA_ASSERT(var->Declaration()->Node()->IsTSInterfaceDeclaration());
+            type = checker->BuildBasicInterfaceProperties(var->Declaration()->Node()->AsTSInterfaceDeclaration());
+        }
+        checker->GetGlobalTypesHolder()->InitializeBuiltin(iterator->first, type);
     }
-    checker->GetGlobalTypesHolder()->InitializeBuiltin(iterator->first, type);
     return iterator->first;
 }
 
diff --git a/ets2panda/test/ast/compiler/ets/typealias_conflict_with_builtin.ets b/ets2panda/test/ast/compiler/ets/typealias_conflict_with_builtin.ets
new file mode 100644
index 0000000000000000000000000000000000000000..80fc58e64188eedb24fa7c62050c0ad92d25ce3d
--- /dev/null
+++ b/ets2panda/test/ast/compiler/ets/typealias_conflict_with_builtin.ets
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+type Type  = int;
+
+/* @@? 1:3 Error TypeError: Class 'Type' is already defined with different type. */