diff --git a/vsexprtools/variables.py b/vsexprtools/variables.py
index 4ad720b..244d890 100644
--- a/vsexprtools/variables.py
+++ b/vsexprtools/variables.py
@@ -358,7 +358,7 @@ def depth(self) -> LiteralVar:
 
     # Helper functions
     def scale(
-        self, value: float, input_depth: int = 8, range_in: ColorRange = ColorRange.LIMITED,
+        self, value: float, input_depth: int = 8, range_in: ColorRangeT | None = None,
         range_out: ColorRangeT | None = None, offsets: bool = False
     ) -> ComplexVar:
         @ComplexVar.resolver