diff --git a/manimlib/mobject/coordinate_systems.py b/manimlib/mobject/coordinate_systems.py
index bb8b5aa160..3fd4a468d7 100644
--- a/manimlib/mobject/coordinate_systems.py
+++ b/manimlib/mobject/coordinate_systems.py
@@ -417,7 +417,7 @@ def get_area_under_graph(self, graph, x_range, fill_color=BLUE, fill_opacity=0.5
             raise Exception("Argument `graph` must have attribute `x_range`")
 
         alpha_bounds = [
-            inverse_interpolate(*graph.x_range, x)
+            inverse_interpolate(*graph.x_range[:2], x)
             for x in x_range
         ]
         sub_graph = graph.copy()