diff --git a/libmm-glib/mm-manager.c b/libmm-glib/mm-manager.c
index 37f3ac4f..81f2041a 100644
--- a/libmm-glib/mm-manager.c
+++ b/libmm-glib/mm-manager.c
@@ -595,9 +595,28 @@ initable_init_async (GAsyncInitable      *initable,
 
 /*****************************************************************************/
 
+static void
+register_dbus_errors (void)
+{
+  static volatile guint32 aux = 0;
+
+  if (aux)
+      return;
+
+  /* Register all known own errors */
+  aux |= MM_CORE_ERROR;
+  aux |= MM_MOBILE_EQUIPMENT_ERROR;
+  aux |= MM_CONNECTION_ERROR;
+  aux |= MM_SERIAL_ERROR;
+  aux |= MM_MESSAGE_ERROR;
+  aux |= MM_CDMA_ACTIVATION_ERROR;
+}
+
 static void
 mm_manager_init (MMManager *manager)
 {
+    register_dbus_errors ();
+
     /* Setup private data */
     manager->priv = G_TYPE_INSTANCE_GET_PRIVATE ((manager),
                                                  MM_TYPE_MANAGER,