diff --git a/nipype/interfaces/mrtrix3/reconst.py b/nipype/interfaces/mrtrix3/reconst.py
index 2f2854ed8c..551dd3ed5e 100644
--- a/nipype/interfaces/mrtrix3/reconst.py
+++ b/nipype/interfaces/mrtrix3/reconst.py
@@ -108,13 +108,9 @@ class EstimateFODInputSpec(MRTrix3BaseInputSpec):
         desc="output WM ODF",
     )
     gm_txt = File(argstr="%s", position=-4, desc="GM response text file")
-    gm_odf = File(
-        "gm.mif", usedefault=True, argstr="%s", position=-3, desc="output GM ODF"
-    )
+    gm_odf = File(argstr="%s", position=-3, desc="output GM ODF")
     csf_txt = File(argstr="%s", position=-2, desc="CSF response text file")
-    csf_odf = File(
-        "csf.mif", usedefault=True, argstr="%s", position=-1, desc="output CSF ODF"
-    )
+    csf_odf = File(argstr="%s", position=-1, desc="output CSF ODF")
     mask_file = File(exists=True, argstr="-mask %s", desc="mask image")
 
     # DW Shell selection options
@@ -126,8 +122,6 @@ class EstimateFODInputSpec(MRTrix3BaseInputSpec):
     )
     max_sh = InputMultiObject(
         traits.Int,
-        value=[8],
-        usedefault=True,
         argstr="-lmax %s",
         sep=",",
         desc=(
@@ -166,7 +160,7 @@ class EstimateFOD(MRTrix3Base):
     >>> fod.inputs.wm_txt = 'wm.txt'
     >>> fod.inputs.grad_fsl = ('bvecs', 'bvals')
     >>> fod.cmdline                               # doctest: +ELLIPSIS
-    'dwi2fod -fslgrad bvecs bvals -lmax 8 csd dwi.mif wm.txt wm.mif gm.mif csf.mif'
+    'dwi2fod -fslgrad bvecs bvals csd dwi.mif wm.txt wm.mif'
     >>> fod.run()                                 # doctest: +SKIP
     """