diff --git a/lib/workflower/acts_as_workflower.rb b/lib/workflower/acts_as_workflower.rb
index fa42410..478a10e 100644
--- a/lib/workflower/acts_as_workflower.rb
+++ b/lib/workflower/acts_as_workflower.rb
@@ -48,6 +48,14 @@ module Workflower
         @allowed_transitions ||= @workflower_base.allowed_transitions
       end
 
+      def workflower_uninitializer
+        @workflower_base.uninitialize
+
+        @possible_events     = []
+        @allowed_events      = []
+        @allowed_transitions = []
+      end
+
       def initialize(*)
         super
         write_attribute :workflow_id, default_workflow_id if workflow_id.blank?
diff --git a/lib/workflower/manager.rb b/lib/workflower/manager.rb
index ebc514f..5d6f02b 100644
--- a/lib/workflower/manager.rb
+++ b/lib/workflower/manager.rb
@@ -18,6 +18,20 @@ module Workflower
       @validation_errors = []
     end
 
+    def uninitialize
+      @transitions = []
+      @current_state = []
+      @current_sequence = []
+      @calling_model    = []
+      @source           = []
+
+      # Flows
+      @flows_container = []
+      @events = []
+      @allowed_events = []
+      @validation_errors = []
+    end
+
     def buildup_flows
       possible_transitions.map { |transition| Workflower::Flow.new(transition) }
     end