diff --git a/lib/simplekit.rb b/lib/simplekit.rb
index cf428b4385a729009fc2955b0f92cfbc1947e0bb..5ebfcfa603324d91892c7fa45acc8e5a5096ef38 100644
--- a/lib/simplekit.rb
+++ b/lib/simplekit.rb
@@ -54,7 +54,7 @@ module SimpleKit
     #   - +args+ -> an optional list of arguments to pass to the event
     #     at invocation time.
     def schedule(event, delay, *args)
-      fail 'Model scheduled event with negative delay.' if delay < 0
+      raise 'Model scheduled event with negative delay.' if delay < 0
       @event_list.push EventNotice.new(event, @model_time + delay, args)
     end