diff --git a/sasmodels/models/star_polymer.py b/sasmodels/models/star_polymer.py
index ab2f8f36..be038204 100644
--- a/sasmodels/models/star_polymer.py
+++ b/sasmodels/models/star_polymer.py
@@ -96,7 +96,7 @@ def random():
 
 tests = [[{'rg_squared': 2.0,
            'arms':    3.3,
-          }, 0.5, 0.851646091108],
+          }, 0.5, 0.8518871750393033],
 
          [{'rg_squared':    1.0,
            'arms':       2.0,