diff --git a/recipes/server.rb b/recipes/server.rb
index 6fe00c9..c45c4fe 100644
--- a/recipes/server.rb
+++ b/recipes/server.rb
@@ -26,7 +26,7 @@
 end
   
 static_tcp_reg_key = 'HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\\' + node['sql_server']['reg_version'] +
-  service_name + '\MSSQLServer\SuperSocketNetLib\Tcp\IPAll'
+  node['sql_server']['instance_name'] + '\MSSQLServer\SuperSocketNetLib\Tcp\IPAll'
 
 # generate and set a password for the 'sa' super user
 node.set_unless['sql_server']['server_sa_password'] = "#{secure_password}-aA12"