diff --git a/app/controllers/vouchers_controller.rb b/app/controllers/vouchers_controller.rb
index 991d797..84bb25b 100644
--- a/app/controllers/vouchers_controller.rb
+++ b/app/controllers/vouchers_controller.rb
@@ -5,7 +5,7 @@ class VouchersController < ApplicationController
   # GET /vouchers
   def index
     @vouchers = Voucher.all
-    whitelist = %x[mcrcon -c -H mine.vereto.net -p #{ENV["MC_RCON_PASS"]} 'whitelist list' | sed 's/There are*.*whitelisted players: //g'].gsub("\n", "").split(", ")
+    whitelist = system 'mcrcon -c -H mine.vereto.net -p #{ENV["MC_RCON_PASS"]} "whitelist list" | sed "s/There are*.*whitelisted players: //g"'.gsub("\n", "").split(", ")
 
     render json: { :vouchers => @vouchers, :whitelist => whitelist }.to_json
   end