diff --git a/telethon/client/users.py b/telethon/client/users.py
index accdba77..15fcf771 100644
--- a/telethon/client/users.py
+++ b/telethon/client/users.py
@@ -82,7 +82,7 @@ class UserMethods:
                     e.__class__.__name__, e)
 
                 await asyncio.sleep(2)
-            except (errors.FloodWaitError, errors.SlowmodeWaitError, errors.FloodTestPhoneWaitError) as e:
+            except (errors.FloodWaitError, errors.SlowModeWaitError, errors.FloodTestPhoneWaitError) as e:
                 if utils.is_list_like(request):
                     request = request[request_index]
 
diff --git a/telethon_generator/parsers/errors.py b/telethon_generator/parsers/errors.py
index 4fb9d43d..45ad27c7 100644
--- a/telethon_generator/parsers/errors.py
+++ b/telethon_generator/parsers/errors.py
@@ -28,7 +28,8 @@ def _get_class_name(error_code):
         )
 
     return snake_to_camel_case(
-        error_code.replace('FIRSTNAME', 'FIRST_NAME').lower(), suffix='Error')
+        error_code.replace('FIRSTNAME', 'FIRST_NAME')\
+        .replace('SLOWMODE', 'SLOW_MODE').lower(), suffix='Error')
 
 
 class Error: