diff --git a/bob/fusion/base/config/algorithm/mean.py b/bob/fusion/base/config/algorithm/mean.py
index 9f6944d8799ffa8027b92b8b02c4d95d290fb699..7a52e39ec0702f64fe20d5f80d68ac0bbfcc3350 100644
--- a/bob/fusion/base/config/algorithm/mean.py
+++ b/bob/fusion/base/config/algorithm/mean.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
 import bob.fusion.base
+from sklearn.preprocessing import StandardScaler
 
-algorithm = bob.fusion.base.algorithm.Weighted_Sum()
+algorithm = bob.fusion.base.algorithm.Weighted_Sum(preprocessors=[StandardScaler()])