@@ -1250,39 +1250,33 @@ class MTNormaliseInputSpec(MRTrix3BaseInputSpec):
 wm_fod = File(
 argstr="%s",
 exists=True,
-mandatory=False,
 position=1,
 desc="input fod of white matter tissue compartment"
 )
 out_file_wm = File(
 argstr="%s",
-mandatory=False,
 position=2,
 desc="output file of white matter tissue compartment"
 )
 gm_fod = File(
 argstr="%s",
 exists=True,
-mandatory=False,
 position=3,
 desc="input fod of grey matter tissue compartment"
 )
 out_file_gm = File(
 argstr="%s",
-mandatory=False,
 position=4,
 desc="output file of grey matter tissue compartment"
 )
 csf_fod = File(
 argstr="%s",
 exists=True,
-mandatory=False,
 position=5,
 desc="input fod of CSF tissue compartment"
 )
 out_file_csf = File(
 argstr="%s",
-mandatory=False,
 position=6,
 desc="output file of CSF tissue compartment 3"
 )