diff --git a/app/models/project.rb b/app/models/project.rb
index 4a54b22..aacb01c 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -751,7 +751,7 @@ class Project < ActiveRecord::Base
     # clear unique attributes
     attributes = project.attributes.dup.except('id', 'name', 'identifier', 'status', 'parent_id', 'lft', 'rgt')
     copy = Project.new(attributes)
-    copy.enabled_modules = project.enabled_modules
+    copy.enabled_module_names = project.enabled_module_names
     copy.trackers = project.trackers
     copy.custom_values = project.custom_values.collect {|v| v.clone}
     copy.issue_custom_fields = project.issue_custom_fields