diff --git a/kitty/options/types.py b/kitty/options/types.py
index 3079bc7dd..0949ccc83 100644
--- a/kitty/options/types.py
+++ b/kitty/options/types.py
@@ -614,7 +614,7 @@ class Options:
     term: str = 'xterm-kitty'
     terminfo_type: choices_for_terminfo_type = 'path'
     text_composition_strategy: str = 'platform'
-    text_fg_override_threshold: tuple[float, str] = (0.0, '%')
+    text_fg_override_threshold: tuple[float, typing.Literal['%', 'ratio']] = (0.0, '%')
     touch_scroll_multiplier: float = 1.0
     transparent_background_colors: tuple[tuple[kitty.fast_data_types.Color, float], ...] = ()
     undercurl_style: choices_for_undercurl_style = 'thin-sparse'
diff --git a/kitty/options/utils.py b/kitty/options/utils.py
index f468c54fa..4f401af41 100644
--- a/kitty/options/utils.py
+++ b/kitty/options/utils.py
@@ -753,8 +753,8 @@ def active_tab_title_template(x: str) -> str | None:
     return None if x == 'none' else x
 
 
-def text_fg_override_threshold(x: str) -> tuple[float, str]:
-    return number_with_unit(x, '%', 'ratio')
+def text_fg_override_threshold(x: str) -> tuple[float, Literal['%', 'ratio']]:
+    return number_with_unit(x, '%', 'ratio')  # type: ignore
 
 
 ClearOn = Literal['next', 'focus']