diff --git a/src/textual/widgets/_radio_button.py b/src/textual/widgets/_radio_button.py
index ec1fff040..789bb8829 100644
--- a/src/textual/widgets/_radio_button.py
+++ b/src/textual/widgets/_radio_button.py
@@ -1,5 +1,7 @@
 """Provides a radio button widget."""
 
+from __future__ import annotations
+
 from ._toggle import ToggleButton