diff --git a/ets2panda/compiler/core/ETSemitter.cpp b/ets2panda/compiler/core/ETSemitter.cpp
index f4f15ac06c0d8fadfcb50969c7e52475a67567de..5a8eb413b34e7c69f5a947b9b1855b627411fb45 100644
--- a/ets2panda/compiler/core/ETSemitter.cpp
+++ b/ets2panda/compiler/core/ETSemitter.cpp
@@ -137,6 +137,9 @@ static pandasm::Function GenScriptFunction(const ir::ScriptFunction *scriptFunc,
 
     if (scriptFunc->IsConstructor() || scriptFunc->IsStaticBlock()) {
         func.returnType = pandasm::Type(Signatures::PRIMITIVE_VOID, 0);
+    } else if (scriptFunc->Signature()->HasSignatureFlag(checker::SignatureFlags::THIS_RETURN_TYPE) &&
+               scriptFunc->Signature()->HasSignatureFlag(checker::SignatureFlags::EXTENSION_FUNCTION)) {
+        func.returnType = PandasmTypeWithRank(paramScope->Params()[0]->TsType());
     } else {
         func.returnType = PandasmTypeWithRank(scriptFunc->Signature()->ReturnType());
     }
diff --git a/ets2panda/test/ast/compiler/ets/external_func_record/file1.ets b/ets2panda/test/ast/compiler/ets/external_func_record/file1.ets
new file mode 100755
index 0000000000000000000000000000000000000000..915efd07351db1cc8ab4fb9df8d57f11ef534eb1
--- /dev/null
+++ b/ets2panda/test/ast/compiler/ets/external_func_record/file1.ets
@@ -0,0 +1,17 @@
+/*
+ * 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.
+ */
+
+export class A {}
+export function foo(this: A):this {return this}
\ No newline at end of file
diff --git a/ets2panda/test/ast/compiler/ets/external_func_record/main_test.ets b/ets2panda/test/ast/compiler/ets/external_func_record/main_test.ets
new file mode 100755
index 0000000000000000000000000000000000000000..e238e0fb4d95704e35d0b3e1c2bc5491641b797c
--- /dev/null
+++ b/ets2panda/test/ast/compiler/ets/external_func_record/main_test.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.
+ */
+
+import {A, foo} from "./file1"
+let a = new A();
+a.foo();