diff --git a/spb/graphics/utils.py b/spb/graphics/utils.py
index a521530..cc973ef 100644
--- a/spb/graphics/utils.py
+++ b/spb/graphics/utils.py
@@ -55,7 +55,9 @@ def linspace(start, end, n):
 
             kw = wf_kwargs.copy()
             if s.is_interactive:
-                kw["params"] = s.params.copy()
+                # pass in the original parameters provided by the user, which
+                # might contain RangeSlider...
+                kw["params"] = s._original_params.copy()
 
             if s.is_parametric:
                 (x, sx, ex), (y, sy, ey) = s.ranges