diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 5abfb14ab..702c4cad3 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -5,6 +5,7 @@ repos:
     -   id: black
         args:
         - --diff
+        - --check
 -   repo: https://gitlab.com/pycqa/flake8
     rev: 3.8.1
     hooks:
diff --git a/pyproject.toml b/pyproject.toml
index 0e944ee55..4de04cce4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,11 @@
 [tool.black]
 line-length = 99
 target-version = ['py36']
+skip-string-normalization = true
+
+# We need to force-exclude the negated include pattern so
+# so that pre-commit run --all-files does the correct thing
+# see https://github.com/psf/black/issues/1778
+force-exclude = '^(?!(telegram|examples|tests)/).*\.py$'
 include = '(telegram|examples|tests)/.*\.py$'
-exclude = 'telegram/vendor'
-skip-string-normalization = true
\ No newline at end of file
+exclude = 'telegram/vendor'
\ No newline at end of file
diff --git a/telegram/chat.py b/telegram/chat.py
index d39b674f4..2113f176b 100644
--- a/telegram/chat.py
+++ b/telegram/chat.py
@@ -154,14 +154,14 @@ class Chat(TelegramObject):
     def is_anonymous_admin(self) -> bool:
         """:obj:`bool`: Convenience property. Returns :obj:`True`, if this chat is with is the bot
         representing anonymous admins. This behaviour is undocumented and might be changed
-        by Telegram. """
+        by Telegram."""
 
         return self.id == constants.ANONYMOUS_ADMIN_ID
 
     @property
     def is_service_chat(self) -> bool:
         """:obj:`bool`: Convenience property. Returns :obj:`True`, if this chat is the Telegram
-        service chat. This behaviour is undocumented and might be changed by Telegram. """
+        service chat. This behaviour is undocumented and might be changed by Telegram."""
 
         return self.id == constants.SERVICE_CHAT_ID
 
diff --git a/telegram/chatmember.py b/telegram/chatmember.py
index 59f9c069c..153dfa81a 100644
--- a/telegram/chatmember.py
+++ b/telegram/chatmember.py
@@ -111,6 +111,7 @@ class ChatMember(TelegramObject):
             may add web page previews to his messages.
 
     """
+
     ADMINISTRATOR: ClassVar[str] = constants.CHATMEMBER_ADMINISTRATOR
     """:const:`telegram.constants.CHATMEMBER_ADMINISTRATOR`"""
     CREATOR: ClassVar[str] = constants.CHATMEMBER_CREATOR
diff --git a/telegram/ext/messagequeue.py b/telegram/ext/messagequeue.py
index 5335eeec5..d268b18fd 100644
--- a/telegram/ext/messagequeue.py
+++ b/telegram/ext/messagequeue.py
@@ -305,7 +305,7 @@ def queuedmessage(method: Callable) -> Callable:
     @functools.wraps(method)
     def wrapped(self: 'Bot', *args: Any, **kwargs: Any) -> Any:
         queued = kwargs.pop(
-            'queued', self._is_messages_queued_default   # type: ignore[attr-defined]
+            'queued', self._is_messages_queued_default  # type: ignore[attr-defined]
         )
         isgroup = kwargs.pop('isgroup', False)
         if queued:
diff --git a/telegram/message.py b/telegram/message.py
index 8fb04c77b..5b39ad547 100644
--- a/telegram/message.py
+++ b/telegram/message.py
@@ -1579,7 +1579,8 @@ class Message(TelegramObject):
                 markdown_text += message_text[last_offset:]
             else:
                 markdown_text += message_text[last_offset * 2 :].decode(  # type: ignore
-                    'utf-16-le')
+                    'utf-16-le'
+                )
 
         return markdown_text
 
diff --git a/tests/test_conversationhandler.py b/tests/test_conversationhandler.py
index 06b99e42e..ae7986240 100644
--- a/tests/test_conversationhandler.py
+++ b/tests/test_conversationhandler.py
@@ -568,7 +568,9 @@ class TestConversationHandler:
         assert len(handler.conversations) == 0
 
     def test_end_on_first_message_async(self, dp, bot, user1):
-        start_end_async = (lambda bot, update: dp.run_async(self.start_end, bot, update))
+        start_end_async = lambda bot, update: dp.run_async(  # noqa: E731
+            self.start_end, bot, update
+        )
 
         handler = ConversationHandler(
             entry_points=[CommandHandler('start', start_end_async)], states={}, fallbacks=[]
@@ -645,7 +647,9 @@ class TestConversationHandler:
         assert len(handler.conversations) == 0
 
     def test_none_on_first_message_async(self, dp, bot, user1):
-        start_none_async = (lambda bot, update: dp.run_async(self.start_none, bot, update))
+        start_none_async = lambda bot, update: dp.run_async(  # noqa: E731
+            self.start_none, bot, update
+        )
 
         handler = ConversationHandler(
             entry_points=[CommandHandler('start', start_none_async)], states={}, fallbacks=[]