diff --git a/nipype/interfaces/fsl/ICA_AROMA.py b/nipype/interfaces/fsl/ICA_AROMA.py
index 7129602d65..9828a93cc3 100644
--- a/nipype/interfaces/fsl/ICA_AROMA.py
+++ b/nipype/interfaces/fsl/ICA_AROMA.py
@@ -13,7 +13,7 @@
 
 from __future__ import print_function, division, unicode_literals, absolute_import
 from ..base import (TraitedSpec, CommandLineInputSpec, CommandLine,
-                    File, Directory, traits)
+                    File, Directory, traits, isdefined)
 import os
 
 
@@ -109,7 +109,7 @@ def _list_outputs(self):
         else:
             outputs['out_dir'] = self._gen_filename('out_dir')
         out_dir = outputs['out_dir']
-        
+
         if self.inputs.denoise_type in ('aggr', 'both'):
             outputs['aggr_denoised_file'] = os.path.join(out_dir, 'denoised_func_data_aggr.nii.gz')
         if self.inputs.denoise_type in ('nonaggr', 'both'):
@@ -119,5 +119,3 @@ def _list_outputs(self):
     def _gen_filename(self, name):
         if name == 'out_dir':
             return os.getcwd()
-
-