diff --git a/src/textual/app.py b/src/textual/app.py
index ef1260032..758afea0e 100644
--- a/src/textual/app.py
+++ b/src/textual/app.py
@@ -63,7 +63,7 @@ from .messages import CallbackType
 from .reactive import Reactive
 from .renderables.blank import Blank
 from .screen import Screen
-from .widget import AwaitMount, MountError, Widget
+from .widget import AwaitMount, Widget
 
 
 if TYPE_CHECKING: