diff --git a/bluepyopt/ephys/objectives.py b/bluepyopt/ephys/objectives.py
index e55c337d..e5b12848 100644
--- a/bluepyopt/ephys/objectives.py
+++ b/bluepyopt/ephys/objectives.py
@@ -99,7 +99,7 @@ def __init__(self, name, feature, weight):
             weight (float): weight to scale to the efeature with
         """
 
-        super(SingletonWeightObjective, self).__init__(name, [feature])
+        super(SingletonWeightObjective, self).__init__(name, feature)
         self.weight = weight
 
     def calculate_score(self, responses):