diff --git a/sys/ofed/drivers/infiniband/core/mad.c b/sys/ofed/drivers/infiniband/core/mad.c
index 3eedca1d6b6..a78dd3ac10f 100644
--- a/sys/ofed/drivers/infiniband/core/mad.c
+++ b/sys/ofed/drivers/infiniband/core/mad.c
@@ -1053,7 +1053,7 @@ static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 	 */
 	cancel_mads(mad_agent_priv);
 	port_priv = mad_agent_priv->qp_info->port_priv;
-	cancel_delayed_work(&mad_agent_priv->timed_work);
+	cancel_delayed_work_sync(&mad_agent_priv->timed_work);
 
 	spin_lock_irqsave(&port_priv->reg_lock, flags);
 	remove_mad_reg_req(mad_agent_priv);