diff --git a/lib/did_you_mean.rb b/lib/did_you_mean.rb
index 6a680fe975..6d3a6e8bda 100644
--- a/lib/did_you_mean.rb
+++ b/lib/did_you_mean.rb
@@ -106,7 +106,7 @@ module DidYouMean
   end
 
   # Updates the primary formatter used to format the suggestions.
-  def self.formatter=(*)
+  def self.formatter=(formatter)
     @formatter = formatter
   end