diff --git a/bin/draining_servers.rb b/bin/draining_servers.rb
index 12f0ba4e174..7e1a4e95c25 100644
--- a/bin/draining_servers.rb
+++ b/bin/draining_servers.rb
@@ -61,6 +61,7 @@ end
 def getServerNames(hostOrServers, config)
   ret = []
   connection = ConnectionFactory.createConnection(config)
+  admin = nil
 
   hostOrServers.each do |host_or_server|
     # check whether it is already serverName. No need to connect to cluster