diff --git a/nipype/interfaces/fsl/utils.py b/nipype/interfaces/fsl/utils.py
index e237124bb3..f4ef73c0e9 100644
--- a/nipype/interfaces/fsl/utils.py
+++ b/nipype/interfaces/fsl/utils.py
@@ -551,9 +551,9 @@ def _list_outputs(self):
         """
         outputs = self._outputs().get()
         ext = Info.output_type_to_ext(self.inputs.output_type)
-        outbase = 'vol*'
+        outbase = 'vol[0-9]*'
         if isdefined(self.inputs.out_base_name):
-            outbase = '%s*' % self.inputs.out_base_name
+            outbase = '%s[0-9]*' % self.inputs.out_base_name
         outputs['out_files'] = sorted(
             glob(os.path.join(os.getcwd(), outbase + ext)))
         return outputs