diff --git a/lib/elo/rating.rb b/lib/elo/rating.rb
index 0b954b4..b1bb565 100644
--- a/lib/elo/rating.rb
+++ b/lib/elo/rating.rb
@@ -50,7 +50,7 @@ def expected
 		# For more information visit
 		# {Wikipedia}[http://en.wikipedia.org/wiki/Elo_rating_system#Mathematical_details]
     def change
-      k_factor.to_f * ( result.to_f - expected )
+      (k_factor.to_f * ( result.to_f - expected )).to_i
     end