diff --git a/fsl/wrappers/melodic.py b/fsl/wrappers/melodic.py
index b95aeabfa9c4ee287d18fbf3fa76f7d4fa90297d..f39d9cce3119edd89820af0e73c2c7cdcde5593d 100644
--- a/fsl/wrappers/melodic.py
+++ b/fsl/wrappers/melodic.py
@@ -50,8 +50,6 @@ def melodic(input, **kwargs):
         'logPower'     : wutils.SHOW_IF_TRUE,
     }
 
-    asrt.assertIsNifti(input)
-
     cmd  = ['melodic', '--in={}'.format(input)]
     cmd += wutils.applyArgStyle('--=', valmap=valmap, **kwargs)