diff --git a/core/src/trezor/wire/thp/session_context.py b/core/src/trezor/wire/thp/session_context.py
index c5572ca0e..c9a04cb8d 100644
--- a/core/src/trezor/wire/thp/session_context.py
+++ b/core/src/trezor/wire/thp/session_context.py
@@ -12,14 +12,10 @@ from .channel import Channel
 if TYPE_CHECKING:
     from typing import Container  # pyright: ignore[reportShadowedImports]
 
+    pass
 
-class UnexpectedMessageWithType(Exception):
-    """A message was received that is not part of the current workflow.
-
-    Utility exception to inform the session handler that the current workflow
-    should be aborted and a new one started as if `msg` was the first message.
-    """
 
+class UnexpectedMessageWithType(Exception):
     def __init__(self, msg: MessageWithType) -> None:
         super().__init__()
         self.msg = msg