diff --git a/nipype/interfaces/fsl/ICA_AROMA.py b/nipype/interfaces/fsl/ICA_AROMA.py
index 764c71a475..a93dc7f37c 100644
--- a/nipype/interfaces/fsl/ICA_AROMA.py
+++ b/nipype/interfaces/fsl/ICA_AROMA.py
@@ -107,6 +107,7 @@ class ICA_AROMA(CommandLine):
     output_spec = ICA_AROMAOutputSpec
 
     def _list_outputs(self):
+        outputs = self.output_spec().get()
         out_dir = os.path.abspath(self.inputs.out_dir)
         outputs['out_dir'] = out_dir