diff --git a/nipype/interfaces/fsl/utils.py b/nipype/interfaces/fsl/utils.py
index 3edc3a73e6..545be0e2d5 100644
--- a/nipype/interfaces/fsl/utils.py
+++ b/nipype/interfaces/fsl/utils.py
@@ -2045,7 +2045,7 @@ class MotionOutliersInputSpec(FSLCommandInputSpec):
 
 
 class MotionOutliersOutputSpec(TraitedSpec):
-    out_file = File(exists=True)
+    out_file = File()
     out_metric_values = File(exists=True)
     out_metric_plot = File(exists=True)