diff --git a/gajim/gtk/groupchat_creation.py b/gajim/gtk/groupchat_creation.py
index 63cb055ec5e3dad8aefea6c6c6b0af8db924c743..43e2a468a9e8b73a885590641162b689b12b8128 100644
--- a/gajim/gtk/groupchat_creation.py
+++ b/gajim/gtk/groupchat_creation.py
@@ -40,6 +40,8 @@ def __init__(self, account):
         self.set_name('CreateGroupchat')
         self.set_application(app.app)
         self.set_position(Gtk.WindowPosition.CENTER)
+        self.set_type_hint(Gdk.WindowTypeHint.DIALOG)
+        self.set_default_size(500, -1)
         self.set_show_menubar(False)
         self.set_resizable(True)
         self.set_title(_('Create Group Chat'))