diff --git a/evaluation/calculator.rb b/evaluation/calculator.rb
index b8cb841..08708f4 100644
--- a/evaluation/calculator.rb
+++ b/evaluation/calculator.rb
@@ -33,7 +33,7 @@ def report(message, &block)
     DidYouMean::JaroWinkler.module_eval do
       module_function
       def distance(str1, str2)
-        ::JaroWinkler.distance(str1, str2)
+        ::JaroWinkler.similarity(str1, str2)
       end if RUBY_ENGINE != 'jruby'
     end
   rescue LoadError, NameError => e