diff --git a/lib/mutant/diff.rb b/lib/mutant/diff.rb
index 8c90ec48..382c93d2 100644
--- a/lib/mutant/diff.rb
+++ b/lib/mutant/diff.rb
@@ -99,7 +99,7 @@ module Mutant
     # @api private
     #
     def minimized_hunks
-      head, *tail = hunks()
+      head, *tail = hunks
 
       tail.each_with_object([head]) do |right, aggregate|
         left = aggregate.last