diff --git a/lib/golf.rb b/lib/golf.rb
index bb30d32..15a8cfb 100644
--- a/lib/golf.rb
+++ b/lib/golf.rb
@@ -24,7 +24,7 @@
     }
 
     a.inject([]){|b,c|
-      (b[-1]||[])[-1] == (c-1) ? b[-1] << c : b << [c]
+      (b[-1]||[])[-1] == c-1 ? b[-1] << c : b << [c]
       b
     }.map{|x|[x[0],x[-1]].uniq*"-"}