diff --git a/bob/bio/base/script/figure.py b/bob/bio/base/script/figure.py
index e65c9d310afc4e5276ae50f4784537f3e7522c4f..46aebc454c333a777c644bae5def63fe52bb4c5f 100644
--- a/bob/bio/base/script/figure.py
+++ b/bob/bio/base/script/figure.py
@@ -202,8 +202,8 @@ class Hist(measure_figure.Hist):
     def _setup_hist(self, neg, pos):
         self._title_base = 'Bio scores'
         self._density_hist(
-            pos[0], label='Genuines', alpha=0.9, color='C2', **self._kwargs
+            pos[0], label='Genuines', alpha=0.9, color='C2'
         )
         self._density_hist(
-            neg[0], label='Zero-effort impostors', alpha=0.8, color='C0', **self._kwargs
+            neg[0], label='Zero-effort impostors', alpha=0.8, color='C0'
         )