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-rw-r--r--activemodel/lib/active_model/state_machine/event.rb2
1 files changed, 2 insertions, 0 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