diff --git a/shell/view/ActivityHost.py b/shell/view/ActivityHost.py
index 118b4161..e03dc3a1 100644
--- a/shell/view/ActivityHost.py
+++ b/shell/view/ActivityHost.py
@@ -18,6 +18,7 @@ class ActivityChatWindow(gtk.Window):
 		self.window.set_accept_focus(True)		
 		self.window.set_transient_for(gdk_window)
 		self.set_position(gtk.WIN_POS_CENTER_ALWAYS)
+		self.set_default_size(600, 450)
 
 		self.add(chat_widget)