diff --git a/sumpy/fmm.py b/sumpy/fmm.py
index bc9a79d632abc76d523416a7cb1b5363fdcf5ea2..ed2a1e4bd35b07c4bb1f601c6b850044fdf5539a 100644
--- a/sumpy/fmm.py
+++ b/sumpy/fmm.py
@@ -449,7 +449,6 @@ class SumpyExpansionWrangler(object):
         return local_exps
 
     def eval_multipoles(self,
-            level_start_target_box_nrs,
             target_boxes_by_source_level, source_boxes_by_level, mpole_exps):
         pot = self.output_zeros()