diff --git a/include/typings/box2d.pyi b/include/typings/box2d.pyi
index efedf9bd..f4395374 100644
--- a/include/typings/box2d.pyi
+++ b/include/typings/box2d.pyi
@@ -1,13 +1,13 @@
 from linalg import vec2, vec4
-from typing import Iterable
+from typing import Iterable, Protocol
 
-class _NodeLike:    # duck-type protocol
+class _NodeLike(Protocol):
     def on_box2d_contact_begin(self, other: 'Body'): ...
     def on_box2d_contact_end(self, other: 'Body'): ...
     def on_box2d_pre_step(self): ...
     def on_box2d_post_step(self): ...
 
-class _DrawLike:    # duck-type protocol
+class _DrawLike(Protocol):
     def draw_polygon(self, vertices: list[vec2], color: vec4): ...
     def draw_solid_polygon(self, vertices: list[vec2], color: vec4): ...
     def draw_circle(self, center: vec2, radius: float, color: vec4): ...