diff --git a/test/scholar/linear/isotonic_regression_test.exs b/test/scholar/linear/isotonic_regression_test.exs
index 4f21a7d3..a954a0bd 100644
--- a/test/scholar/linear/isotonic_regression_test.exs
+++ b/test/scholar/linear/isotonic_regression_test.exs
@@ -209,7 +209,7 @@ defmodule Scholar.Linear.IsotonicRegressionTest do
           [43.0, 44.0, 46.0, 47.0, 55.0, 56.0] ++
           [60.0, 61.0, 66.0, 67.0, 71.0, 72.0] ++
           [73.0, 76.0, 77.0, 80.0, 81.0, 87.0] ++
-          [88.0, 92.0, 93.0, 97.0, 98.0]
+          [88.0, 92.0, 93.0, 97.0, 98.0, 99.0]
       )
     )
   end