diff --git a/lib/tasks/migrate_from_mantis.rake b/lib/tasks/migrate_from_mantis.rake
index 499dc7b..d27ef77 100644
--- a/lib/tasks/migrate_from_mantis.rake
+++ b/lib/tasks/migrate_from_mantis.rake
@@ -284,7 +284,7 @@ task :migrate_from_mantis => :environment do
     	# Project members
     	project.members.each do |member|
           m = Member.new :user => User.find_by_id(users_map[member.user_id]),
-    	                 :role => ROLE_MAPPING[member.access_level] || DEFAULT_ROLE
+    	                   :roles => [ROLE_MAPPING[member.access_level] || DEFAULT_ROLE]
     	  m.project = p
     	  m.save
     	end	
diff --git a/lib/tasks/migrate_from_trac.rake b/lib/tasks/migrate_from_trac.rake
index 77d16b7..8640c93 100644
--- a/lib/tasks/migrate_from_trac.rake
+++ b/lib/tasks/migrate_from_trac.rake
@@ -263,7 +263,7 @@ namespace :redmine do
           elsif TracPermission.find_by_username_and_action(username, 'developer')
             role = ROLE_MAPPING['developer']
           end
-          Member.create(:user => u, :project => @target_project, :role => role)
+          Member.create(:user => u, :project => @target_project, :roles => [role])
           u.reload
         end
         u