diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 943ec2d..4c40a2a 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -728,12 +728,11 @@ module ApplicationHelper
 
   def rolename_for(profile, resource)
     roles = profile.role_assignments.select{ |a| a.resource_id == resource.id }.sort_by{ |s| s.role_id }.map(&:role)
-    names = ''
+    names = []
     roles.each do |role|
-      names += content_tag('span', role.name, :style => "color: #{role_color(role, resource.environment.id)}")
-      names += ', '
+      names << content_tag('span', role.name, :style => "color: #{role_color(role, resource.environment.id)}")
     end
-    names.slice 0..-3
+    names.join(', ')
   end
 
   def role_color(role, env_id)
--
libgit2 0.21.2