diff --git a/docs/examples/bias.py b/docs/examples/bias.py
index 5e34c14..3a615b6 100644
--- a/docs/examples/bias.py
+++ b/docs/examples/bias.py
@@ -114,7 +114,7 @@ def response(self, inp: dict) -> dict:
         b_dist = chaospy.Normal(0.0, b)
 
         # generate the polynomial chaos expansion
-        expansion = chaospy.generate_expansion(self.pce_order, bias_dist)
+        expansion = chaospy.generate_expansion(self.pce_order, b_dist)
 
         # generate quadrature nodes and weights
         sparse_quads = chaospy.generate_quadrature(