diff --git a/xmpp_tg/xmpp.py b/xmpp_tg/xmpp.py
index 61bed70..a24876b 100644
--- a/xmpp_tg/xmpp.py
+++ b/xmpp_tg/xmpp.py
@@ -271,7 +271,7 @@ class XMPPTelegram(ComponentXMPP):
 
         def _min_args(self, num_args):
             if len(self.arguments) < num_args:
-                raise WrongNumberOfArgsError("!{} needs at least {} arguments".format(self._command, num_args))
+                raise self.WrongNumberOfArgsError("!{} needs at least {} arguments".format(self._command, num_args))
 
         def __init__(self, msg):
             self._command = msg["body"].split(" ")[0][1:]