diff --git a/app/controllers/hosts_controller.rb b/app/controllers/hosts_controller.rb
index 7666c9efee..fdf32cffb6 100644
--- a/app/controllers/hosts_controller.rb
+++ b/app/controllers/hosts_controller.rb
@@ -53,7 +53,7 @@ def index(title = nil)
         # SQL optimization
         preload_reports
         # rendering index page for non index page requests (out of sync hosts etc)
-        @hostgroup_authorizer = Authorizer.new(User.current, :collection => @hosts.map(&:hostgroup_id).compact.uniq)
+        @hostgroup_authorizer = Authorizer.new(User.current, :collection => @hosts.pluck(:hostgroup_id).compact.uniq)
         render :index if title && (@title = title)
       end
       format.csv do