diff --git a/spiel/app.py b/spiel/app.py
index 8b01e07..1e1e9f0 100644
--- a/spiel/app.py
+++ b/spiel/app.py
@@ -11,7 +11,7 @@
 from functools import cached_property, partial
 from pathlib import Path
 from time import monotonic
-from typing import Callable, ContextManager, Iterator
+from typing import Callable, ClassVar, ContextManager, Iterator, List
 
 from rich.style import Style
 from rich.text import Text
@@ -67,7 +67,7 @@ def load_deck(path: Path) -> Deck:
 
 class SpielApp(App[None]):
     CSS_PATH = "spiel.css"
-    BINDINGS = [
+    BINDINGS: ClassVar[List[Binding]] = [
         Binding("d", "switch_screen('deck')", "Go to the Deck view."),
         Binding("question_mark", "push_screen('help')", "Go to the Help view."),
         Binding("i", "repl", "Switch to the REPL."),
diff --git a/spiel/screens/deck.py b/spiel/screens/deck.py
index de56f77..d78a785 100644
--- a/spiel/screens/deck.py
+++ b/spiel/screens/deck.py
@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+from typing import ClassVar, List
+
 from textual.app import ComposeResult
 from textual.binding import Binding
 
@@ -9,7 +11,7 @@
 
 
 class DeckScreen(SpielScreen):
-    BINDINGS = [
+    BINDINGS: ClassVar[List[Binding]] = [
         Binding("right", "next_slide", "Go to next slide."),
         Binding("left", "prev_slide", "Go to previous slide."),
         Binding("down", "next_row", "Go to next row of slides."),
diff --git a/spiel/screens/help.py b/spiel/screens/help.py
index 025d478..3c4d9d6 100644
--- a/spiel/screens/help.py
+++ b/spiel/screens/help.py
@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+from typing import ClassVar, List
+
 from textual.app import ComposeResult
 from textual.binding import Binding
 from textual.containers import Container
@@ -19,7 +21,7 @@ class HelpScreen(SpielScreen):
     }
     """
 
-    BINDINGS = [
+    BINDINGS: ClassVar[List[Binding]] = [
         Binding("escape,enter", "pop_screen", "Return to the previous view."),
     ]
 
diff --git a/spiel/screens/slide.py b/spiel/screens/slide.py
index cc6ce40..a3e2025 100644
--- a/spiel/screens/slide.py
+++ b/spiel/screens/slide.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import inspect
+from typing import ClassVar, List
 
 from textual.app import ComposeResult
 from textual.binding import Binding
@@ -14,7 +15,7 @@
 
 
 class SlideScreen(SpielScreen):
-    BINDINGS = [
+    BINDINGS: ClassVar[List[Binding]] = [
         Binding("right", "next_slide", "Go to next slide."),
         Binding("left", "prev_slide", "Go to previous slide."),
         Binding("t", "trigger", "Trigger the current slide."),
diff --git a/tests/cli/test_help.py b/tests/cli/test_help.py
index 92aa50e..5f00831 100644
--- a/tests/cli/test_help.py
+++ b/tests/cli/test_help.py
@@ -14,6 +14,6 @@ def test_help(runner: CliRunner) -> None:
 
 
 def test_help_via_main() -> None:
-    result = subprocess.run([sys.executable, "-m", PACKAGE_NAME, "--help"])
+    result = subprocess.run([sys.executable, "-m", PACKAGE_NAME, "--help"], check=False)
 
     assert result.returncode == 0