diff --git a/lib/event.rb b/lib/event.rb
index 1f3612e4..5589bf96 100644
--- a/lib/event.rb
+++ b/lib/event.rb
@@ -34,11 +34,11 @@ def transitions_from_state?(state)
       
       def execute_success_callback(obj)
         case success
-        when String, Symbol:
+        when String, Symbol
           obj.send(success)
-        when Array:
+        when Array
           success.each { |meth| obj.send(meth) }
-        when Proc:
+        when Proc
           success.call(obj)
         end
       end