2 files changed, 6 insertions, 1 deletions
diff --git a/activemodel/lib/active_model/state_machine/event.rb b/activemodel/lib/active_model/state_machine/event.rb
index 8acde7fd47..3eb656b6d6 100644
--- a/activemodel/lib/active_model/state_machine/event.rb
+++ b/activemodel/lib/active_model/state_machine/event.rb
@@ -1,3 +1,5 @@
+require 'active_model/state_machine/state_transition'
+
 module ActiveModel
   module StateMachine
     class Event
diff --git a/activemodel/lib/active_model/state_machine/machine.rb b/activemodel/lib/active_model/state_machine/machine.rb
index 170505c0b2..58c2f1b200 100644
--- a/activemodel/lib/active_model/state_machine/machine.rb
+++ b/activemodel/lib/active_model/state_machine/machine.rb
@@ -1,3 +1,6 @@
+require 'active_model/state_machine/state'
+require 'active_model/state_machine/event'
+
 module ActiveModel
   module StateMachine
     class Machine
@@ -71,4 +74,4 @@ module ActiveModel
       end
     end
   end
-end
-\ No newline at end of file
+end