diff --git a/lib/concurrent/concern/obligation.rb b/lib/concurrent/concern/obligation.rb
index 17c035dbc..2c9ac1200 100644
--- a/lib/concurrent/concern/obligation.rb
+++ b/lib/concurrent/concern/obligation.rb
@@ -138,6 +138,7 @@ def get_arguments_from(opts = {})
       # @!visibility private
       def init_obligation
         @event = Event.new
+        @value = @reason = nil
       end
 
       # @!visibility private