Index: project.rb
===================================================================
--- project.rb	(revision 16640)
+++ project.rb	(working copy)
@@ -181,7 +181,7 @@
     base_statement = (perm && perm.read? ? "#{Project.table_name}.status <> #{Project::STATUS_ARCHIVED}" : "#{Project.table_name}.status = #{Project::STATUS_ACTIVE}")
     if !options[:skip_pre_condition] && perm && perm.project_module
       # If the permission belongs to a project module, make sure the module is enabled
-      base_statement << " AND EXISTS (SELECT 1 AS one FROM #{EnabledModule.table_name} em WHERE em.project_id = #{Project.table_name}.id AND em.name='#{perm.project_module}')"
+      base_statement << " AND #{Project.table_name}.id IN (SELECT em.project_id FROM #{EnabledModule.table_name} em WHERE em.name='#{perm.project_module}')"
     end
     if project = options[:project]
       project_statement = project.project_condition(options[:with_subprojects])