diff --git a/tools/idl-gen/idl_generator.py b/tools/idl-gen/idl_generator.py
index b5f536e1..891850db 100644
--- a/tools/idl-gen/idl_generator.py
+++ b/tools/idl-gen/idl_generator.py
@@ -185,7 +185,7 @@ class IDLGenerator:
         self._idl += "interface %s {\n" % iface["name"]
         for member in iface["members"]:
             self._install_function(iface["name"], member)
-        self._idl += "};\n"
+        self._idl += "}\n"
 
     def _install_function(self, iface_name, member):
         self._idl += "    %s(" % member["name"]
diff --git a/tools/idl-gen/testcase/test_idl_generator.py b/tools/idl-gen/testcase/test_idl_generator.py
index a9dbbf62..e94a6fe9 100644
--- a/tools/idl-gen/testcase/test_idl_generator.py
+++ b/tools/idl-gen/testcase/test_idl_generator.py
@@ -10,6 +10,7 @@
 import json
 import sys
 import unittest
+
 import CppHeaderParser
 
 sys.path.insert(0, '..')
@@ -274,7 +275,7 @@ class IDLGeneratorTestCase(unittest.TestCase):
         self.assertEqual(generator._idl, "interface InputController {\n"
                                          "    RunExtraCommand([in] unsigned int devIndex,[out] unsigned int cmd);\n"
                                          "    RunExtra([in] struct InputControllerDesc desc);\n"
-                                         "};\n")
+                                         "}\n")
 
     def test_install_interface_with_unknown_type(self):
         header_file = """
@@ -289,7 +290,7 @@ class IDLGeneratorTestCase(unittest.TestCase):
         generator._install_interface(parser._header_dict.get("interface")[0])
         self.assertEqual(generator._idl, "interface InputController {\n"
                                          "    RunExtra([in] /* unknown type: [InputControllerDesc] */ desc);\n"
-                                         "};\n")
+                                         "}\n")
 
     def test_install_interface_callback(self):
         header_file = """
@@ -304,7 +305,7 @@ class IDLGeneratorTestCase(unittest.TestCase):
         generator._install_interface(parser._header_dict.get("interface")[0])
         self.assertEqual(generator._idl, "[callback] interface IFooCallback {\n"
                                          "    PushData([in] byte[] message);\n"
-                                         "};\n")
+                                         "}\n")
 
     def test_convert_from_container_type(self):
         generator = IDLGenerator()