diff --git a/vsexprtools/exprop.py b/vsexprtools/exprop.py
index fad9936..5802323 100644
--- a/vsexprtools/exprop.py
+++ b/vsexprtools/exprop.py
@@ -72,7 +72,7 @@ def get_value(self, clip: vs.VideoNode, chroma: bool = False, range_in: ColorRan
             return get_neutral_value(clip)
 
         if self is ExprToken.RangeSize:
-            return (val := get_peak_value(clip)) + (1 - (val <= 1.0))
+            return (val := get_peak_value(clip, range_in=ColorRange.FULL)) + (1 - (val <= 1.0))
 
         if self is ExprToken.RangeMin:
             return get_lowest_value(clip, chroma)