diff --git a/lib/activerecord-import/synchronize.rb b/lib/activerecord-import/synchronize.rb
index 60408e5..cf97dbe 100644
--- a/lib/activerecord-import/synchronize.rb
+++ b/lib/activerecord-import/synchronize.rb
@@ -43,6 +43,7 @@ module ActiveRecord # :nodoc:
           instance.clear_aggregation_cache
           instance.clear_association_cache
           instance.instance_variable_set '@attributes', matched_instance.attributes
+          instance.instance_variable_set '@new_record', false
         end
       end
     end
@@ -52,4 +53,4 @@ module ActiveRecord # :nodoc:
       self.class.synchronize(instances, key)
     end
   end
-end
\ No newline at end of file
+end