diff --git a/play/play.py b/play/play.py
index 07881d9..a901e35 100644
--- a/play/play.py
+++ b/play/play.py
@@ -776,7 +776,7 @@ def _make_pymunk(self):
             self._pymunk_shape = _pymunk.Segment(self._pymunk_body, (self.sprite.x, self.sprite.y), (self.sprite.x1, self.sprite.y1), self.sprite.thickness)
         else:
             if self.stable:
-                moment = _pymunk.inf
+                moment = float('inf')
             elif isinstance(self.sprite, Circle):
                 moment = _pymunk.moment_for_circle(mass, 0, self.sprite.radius, (0, 0))
             elif isinstance(self.sprite, line):
@@ -1748,4 +1748,4 @@ def start_program():
         _loop.run_forever()
     finally:
         _logging.getLogger("asyncio").setLevel(_logging.CRITICAL)
-        pygame.quit()
\ No newline at end of file
+        pygame.quit()