diff --git a/telethon/network/mtproto_sender.py b/telethon/network/mtproto_sender.py
index acda8f05..6ce8a167 100644
--- a/telethon/network/mtproto_sender.py
+++ b/telethon/network/mtproto_sender.py
@@ -329,7 +329,7 @@ class MtProtoSender:
             if self.session.report_errors and request:
                 error = rpc_message_to_error(
                     reader.read_int(), reader.tgread_string(),
-                    report_method=type(request).constructor_id
+                    report_method=type(request).CONSTRUCTOR_ID
                 )
             else:
                 error = rpc_message_to_error(
diff --git a/telethon/telegram_client.py b/telethon/telegram_client.py
index fe140652..0d04ff27 100644
--- a/telethon/telegram_client.py
+++ b/telethon/telegram_client.py
@@ -581,7 +581,7 @@ class TelegramClient(TelegramBareClient):
             return reply_to
 
         if isinstance(reply_to, TLObject) and \
-                type(reply_to).subclass_of_id == 0x790009e3:
+                type(reply_to).SUBCLASS_OF_ID == 0x790009e3:
             # hex(crc32(b'Message')) = 0x790009e3
             return reply_to.id
 
diff --git a/telethon/tl/gzip_packed.py b/telethon/tl/gzip_packed.py
index 9a0d547a..05453d4b 100644
--- a/telethon/tl/gzip_packed.py
+++ b/telethon/tl/gzip_packed.py
@@ -5,7 +5,7 @@ from . import TLObject
 
 
 class GzipPacked(TLObject):
-    constructor_id = 0x3072cfa1
+    CONSTRUCTOR_ID = 0x3072cfa1
 
     def __init__(self, data):
         super().__init__()
@@ -29,7 +29,7 @@ class GzipPacked(TLObject):
 
     def to_bytes(self):
         # TODO Maybe compress level could be an option
-        return struct.pack('<I', GzipPacked.constructor_id) + \
+        return struct.pack('<I', GzipPacked.CONSTRUCTOR_ID) + \
                TLObject.serialize_bytes(gzip.compress(self.data))
 
     @staticmethod
diff --git a/telethon/tl/message_container.py b/telethon/tl/message_container.py
index d0e1aa92..b5a331b9 100644
--- a/telethon/tl/message_container.py
+++ b/telethon/tl/message_container.py
@@ -4,7 +4,7 @@ from . import TLObject
 
 
 class MessageContainer(TLObject):
-    constructor_id = 0x73f1f8dc
+    CONSTRUCTOR_ID = 0x73f1f8dc
 
     def __init__(self, messages):
         super().__init__()
@@ -13,7 +13,7 @@ class MessageContainer(TLObject):
 
     def to_bytes(self):
         return struct.pack(
-            '<Ii', MessageContainer.constructor_id, len(self.messages)
+            '<Ii', MessageContainer.CONSTRUCTOR_ID, len(self.messages)
         ) + b''.join(m.to_bytes() for m in self.messages)
 
     @staticmethod
diff --git a/telethon/tl/tlobject.py b/telethon/tl/tlobject.py
index a99b30b0..1866ba68 100644
--- a/telethon/tl/tlobject.py
+++ b/telethon/tl/tlobject.py
@@ -9,7 +9,6 @@ class TLObject:
         self.rpc_error = None
 
         # These should be overrode
-        self.constructor_id = 0
         self.content_related = False  # Only requests/functions/queries are
 
     # These should not be overrode
diff --git a/telethon/utils.py b/telethon/utils.py
index 0b564236..25104d90 100644
--- a/telethon/utils.py
+++ b/telethon/utils.py
@@ -77,7 +77,7 @@ def get_input_peer(entity):
     if not isinstance(entity, TLObject):
         _raise_cast_fail(entity, 'InputPeer')
 
-    if type(entity).subclass_of_id == 0xc91c90b6:  # crc32(b'InputPeer')
+    if type(entity).SUBCLASS_OF_ID == 0xc91c90b6:  # crc32(b'InputPeer')
         return entity
 
     if isinstance(entity, User):
@@ -118,7 +118,7 @@ def get_input_channel(entity):
     if not isinstance(entity, TLObject):
         _raise_cast_fail(entity, 'InputChannel')
 
-    if type(entity).subclass_of_id == 0x40f202fd:  # crc32(b'InputChannel')
+    if type(entity).SUBCLASS_OF_ID == 0x40f202fd:  # crc32(b'InputChannel')
         return entity
 
     if isinstance(entity, Channel) or isinstance(entity, ChannelForbidden):
@@ -135,7 +135,7 @@ def get_input_user(entity):
     if not isinstance(entity, TLObject):
         _raise_cast_fail(entity, 'InputUser')
 
-    if type(entity).subclass_of_id == 0xe669bf46:  # crc32(b'InputUser')
+    if type(entity).SUBCLASS_OF_ID == 0xe669bf46:  # crc32(b'InputUser')
         return entity
 
     if isinstance(entity, User):
@@ -161,7 +161,7 @@ def get_input_document(document):
     if not isinstance(document, TLObject):
         _raise_cast_fail(document, 'InputDocument')
 
-    if type(document).subclass_of_id == 0xf33fdb68:  # crc32(b'InputDocument')
+    if type(document).SUBCLASS_OF_ID == 0xf33fdb68:  # crc32(b'InputDocument')
         return document
 
     if isinstance(document, Document):
@@ -184,7 +184,7 @@ def get_input_photo(photo):
     if not isinstance(photo, TLObject):
         _raise_cast_fail(photo, 'InputPhoto')
 
-    if type(photo).subclass_of_id == 0x846363e0:  # crc32(b'InputPhoto')
+    if type(photo).SUBCLASS_OF_ID == 0x846363e0:  # crc32(b'InputPhoto')
         return photo
 
     if isinstance(photo, Photo):
@@ -201,7 +201,7 @@ def get_input_geo(geo):
     if not isinstance(geo, TLObject):
         _raise_cast_fail(geo, 'InputGeoPoint')
 
-    if type(geo).subclass_of_id == 0x430d225:  # crc32(b'InputGeoPoint')
+    if type(geo).SUBCLASS_OF_ID == 0x430d225:  # crc32(b'InputGeoPoint')
         return geo
 
     if isinstance(geo, GeoPoint):
@@ -228,7 +228,7 @@ def get_input_media(media, user_caption=None, is_photo=False):
     if not isinstance(media, TLObject):
         _raise_cast_fail(media, 'InputMedia')
 
-    if type(media).subclass_of_id == 0xfaf846f4:  # crc32(b'InputMedia')
+    if type(media).SUBCLASS_OF_ID == 0xfaf846f4:  # crc32(b'InputMedia')
         return media
 
     if isinstance(media, MessageMediaPhoto):
diff --git a/telethon_generator/tl_generator.py b/telethon_generator/tl_generator.py
index 76de12e5..7b1924fd 100644
--- a/telethon_generator/tl_generator.py
+++ b/telethon_generator/tl_generator.py
@@ -175,9 +175,10 @@ class TLGenerator:
         builder.writeln('class {}(TLObject):'.format(tlobject.class_name()))
 
         # Class-level variable to store its Telegram's constructor ID
-        builder.writeln('constructor_id = {}'.format(hex(tlobject.id)))
-        builder.writeln('subclass_of_id = {}'.format(
-            hex(crc32(tlobject.result.encode('ascii')))))
+        builder.writeln('CONSTRUCTOR_ID = {}'.format(hex(tlobject.id)))
+        builder.writeln('SUBCLASS_OF_ID = {}'.format(
+            hex(crc32(tlobject.result.encode('ascii'))))
+        )
         builder.writeln()
 
         # Flag arguments must go last