diff --git a/icingabot.py b/icingabot.py
index 42ee38d..57fe353 100755
--- a/icingabot.py
+++ b/icingabot.py
@@ -225,7 +225,7 @@ class IcingaBot(Icinga2ServiceManager, irc.bot.SingleServerIRCBot):
         return
 
     def on_nicknameinuse(self, c, e):
-        c.nick(+"_")
+        c.nick(c.get_nickname() + "_")
 
     def on_welcome(self, c, e):
         c.join(self.channel)