diff --git a/ets2panda/checker/ets/helpers.cpp b/ets2panda/checker/ets/helpers.cpp
index dd5d023d62c7fecbc4b73fddc9445fff3850ba46..8a8ad698f0dfe1d32a8f9fdd44022ae59d4a4e2a 100644
--- a/ets2panda/checker/ets/helpers.cpp
+++ b/ets2panda/checker/ets/helpers.cpp
@@ -443,7 +443,8 @@ Type *ETSChecker::ApplyUnaryOperatorPromotion(ir::Expression *expr, Type *type,
             [[fallthrough]];
         case TypeFlag::INT:
             return GlobalIntBuiltinType();
-
+        case TypeFlag::LONG:
+            return GlobalLongBuiltinType();
         default:
             break;
     }
diff --git a/ets2panda/test/runtime/ets/long_enum_unary.ets b/ets2panda/test/runtime/ets/long_enum_unary.ets
new file mode 100644
index 0000000000000000000000000000000000000000..1ade249bed460f85f44e29c36c431d82afd45ade
--- /dev/null
+++ b/ets2panda/test/runtime/ets/long_enum_unary.ets
@@ -0,0 +1,30 @@
+/*
+ * 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.
+ */
+
+enum LongEnum{
+     Neg = -0x1_1111_1111,
+     Pos = 0x1_1111_1111,
+     Min = -923372036854775808,
+     Max = 923372036854775808
+
+}
+
+function main() : void {
+     let l = +LongEnum.Neg
+     arktest.assertEQ(+LongEnum.Min,LongEnum.Min)
+     arktest.assertEQ(+LongEnum.Max,LongEnum.Max)
+     arktest.assertEQ(+LongEnum.Neg,LongEnum.Neg)
+     arktest.assertEQ(+LongEnum.Pos,LongEnum.Pos)
+}
\ No newline at end of file