diff --git a/telethon/errors/rpcbaseerrors.py b/telethon/errors/rpcbaseerrors.py
index fcbbc8b3..8d8a0a66 100644
--- a/telethon/errors/rpcbaseerrors.py
+++ b/telethon/errors/rpcbaseerrors.py
@@ -108,7 +108,7 @@ class ServerError(RPCError):
         self.message = message
 
 
-class BotTimeout(RPCError):
+class TimedOutError(RPCError):
     """
     Clicking the inline buttons of bots that never (or take to long to)
     call ``answerCallbackQuery`` will result in this "special" RPCError.
@@ -121,6 +121,9 @@ class BotTimeout(RPCError):
         self.message = message
 
 
+BotTimeout = TimedOutError
+
+
 class BadMessageError(Exception):
     """Occurs when handling a bad_message_notification."""
     ErrorMessages = {
diff --git a/telethon/version.py b/telethon/version.py
index 831ee031..72bb8cb8 100644
--- a/telethon/version.py
+++ b/telethon/version.py
@@ -1,3 +1,3 @@
 # Versions should comply with PEP440.
 # This line is parsed in setup.py:
-__version__ = '1.7.4'
+__version__ = '1.7.5'
diff --git a/telethon_generator/parsers/errors.py b/telethon_generator/parsers/errors.py
index d3d30c49..4fb9d43d 100644
--- a/telethon_generator/parsers/errors.py
+++ b/telethon_generator/parsers/errors.py
@@ -13,6 +13,7 @@ KNOWN_BASE_CLASSES = {
     406: 'AuthKeyError',
     420: 'FloodError',
     500: 'ServerError',
+    503: 'TimedOutError'
 }
 
 
@@ -23,7 +24,7 @@ def _get_class_name(error_code):
     """
     if isinstance(error_code, int):
         return KNOWN_BASE_CLASSES.get(
-            error_code, 'RPCError' + str(error_code).replace('-', 'Neg')
+            abs(error_code), 'RPCError' + str(error_code).replace('-', 'Neg')
         )
 
     return snake_to_camel_case(
@@ -38,7 +39,7 @@ class Error:
         self.int_code = codes[0]
         self.str_code = name
         self.subclass = _get_class_name(codes[0])
-        self.subclass_exists = codes[0] in KNOWN_BASE_CLASSES
+        self.subclass_exists = abs(codes[0]) in KNOWN_BASE_CLASSES
         self.description = description
 
         self.has_captures = '_X' in name