diff --git a/frequencyoptimizer.py b/frequencyoptimizer.py
index 17e0550..133c2a5 100644
--- a/frequencyoptimizer.py
+++ b/frequencyoptimizer.py
@@ -10,6 +10,7 @@
 import glob
 import warnings
 import parallel
+from os import path
 
     
 
@@ -398,7 +399,7 @@ def scattering_modifications(self,tauds,Weffs,filename="ampratios.npz",directory
         '''
         if len(glob.glob(filename))!=1:
             if directory is None:
-                directory = __file__.split("/")[0] + "/"
+                directory = path.join(path.dirname(__file__), '')
         else:
             directory = ""
         if type(Weffs) != np.ndarray: