diff --git a/test/growth/calc/percentile_test.exs b/test/growth/calc/percentile_test.exs
index 80ab547..5d93649 100644
--- a/test/growth/calc/percentile_test.exs
+++ b/test/growth/calc/percentile_test.exs
@@ -8,7 +8,7 @@ defmodule Growth.Calc.PercentileTest do
   alias Growth.Calc.Percentile
 
   describe "compute/1" do
-    for {zscore, percentile} = params <- [
+    for {zscore, _} = params <- [
           {-3, 0.0013498125},
           {-2, 0.0227502617},
           {-1, 0.1586553192},