diff --git a/sat/plugins/plugin_exp_events.py b/sat/plugins/plugin_exp_events.py
index 520da3a5..3cfac95e 100644
--- a/sat/plugins/plugin_exp_events.py
+++ b/sat/plugins/plugin_exp_events.py
@@ -98,7 +98,7 @@ class Events(object):
         host.bridge.addMethod(
             "eventInviteeGet",
             ".plugin",
-            in_sign="sss",
+            in_sign="ssss",
             out_sign="a{ss}",
             method=self._eventInviteeGet,
             async_=True,