diff --git a/nose/test_potential.py b/nose/test_potential.py
index 48ad4c320..7594557cd 100644
--- a/nose/test_potential.py
+++ b/nose/test_potential.py
@@ -1504,11 +1504,11 @@ def __init__(self):
         return None
 class specialMN3ExponentialDiskPotentialPD(MN3ExponentialDiskPotential):
     def __init__(self):
-        MN3ExponentialDiskPotential.__init__(self,amp=1.,posdens=True)
+        MN3ExponentialDiskPotential.__init__(self,normalize=1.,posdens=True)
         return None
 class specialMN3ExponentialDiskPotentialSECH(MN3ExponentialDiskPotential):
     def __init__(self):
-        MN3ExponentialDiskPotential.__init__(self,amp=1.,sech=True)
+        MN3ExponentialDiskPotential.__init__(self,normalize=1.,sech=True)
         return None
 class mockInterpRZPotential(interpRZPotential):
     def __init__(self):