diff --git a/plugins/mm/calls-mm-call.c b/plugins/mm/calls-mm-call.c
index 2020bc5..fedff85 100644
--- a/plugins/mm/calls-mm-call.c
+++ b/plugins/mm/calls-mm-call.c
@@ -87,6 +87,7 @@ notify_number_cb (CallsMMCall *self,
                   const gchar *number)
 {
   g_string_assign (self->number, number);
+  g_object_notify (G_OBJECT (self), "number");
 }