diff --git a/nipype/interfaces/mrtrix3/preprocess.py b/nipype/interfaces/mrtrix3/preprocess.py
index ef67365f0b..928833aaf6 100644
--- a/nipype/interfaces/mrtrix3/preprocess.py
+++ b/nipype/interfaces/mrtrix3/preprocess.py
@@ -242,6 +242,13 @@ def _format_arg(self, name, trait_spec, value):
                 return f"-{trait_spec.argstr}"
         return super()._format_arg(name, trait_spec, value)
 
+    def _list_outputs(self):
+        outputs = self.output_spec().get()
+        outputs["out_file"] = op.abspath(self.inputs.out_file)
+        if self.inputs.bias:
+            outputs["bias"] = op.abspath(self.inputs.bias)
+        return outputs
+
 
 class DWIPreprocInputSpec(MRTrix3BaseInputSpec):
     in_file = File(