diff --git a/src/textual/_resolve.py b/src/textual/_resolve.py
index f752681986..4c588eefc8 100644
--- a/src/textual/_resolve.py
+++ b/src/textual/_resolve.py
@@ -104,9 +104,9 @@ def resolve_fraction_unit(
     Returns:
         The value of 1fr.
     """
-    F = Fraction
+    _Fraction = Fraction
     if not remaining_space or not widget_styles:
-        return F(1)
+        return _Fraction(1)
 
     initial_space = remaining_space
 
@@ -156,19 +156,19 @@ def resolve_scalar(
 
     while remaining_fraction > 0:
         remaining_space_changed = False
-        resolve_fraction = F(remaining_space, remaining_fraction)
+        resolve_fraction = _Fraction(remaining_space, remaining_fraction)
         for index, (scalar, min_value, max_value) in enumerate(resolve):
             value = resolved[index]
             if value is None:
                 resolved_scalar = scalar.resolve(size, viewport_size, resolve_fraction)
                 if min_value is not None and resolved_scalar < min_value:
                     remaining_space -= min_value
-                    remaining_fraction -= F(scalar.value)
+                    remaining_fraction -= _Fraction(scalar.value)
                     resolved[index] = min_value
                     remaining_space_changed = True
                 elif max_value is not None and resolved_scalar > max_value:
                     remaining_space -= max_value
-                    remaining_fraction -= F(scalar.value)
+                    remaining_fraction -= _Fraction(scalar.value)
                     resolved[index] = max_value
                     remaining_space_changed = True