diff --git a/sys/dev/et/if_et.c b/sys/dev/et/if_et.c
index 78531448906..b59cf78d7f5 100644
--- a/sys/dev/et/if_et.c
+++ b/sys/dev/et/if_et.c
@@ -1326,6 +1326,8 @@ et_free_rx_ring(struct et_softc *sc)
 			struct et_rxbuf *rb = &rbd->rbd_buf[i];
 
 			if (rb->rb_mbuf != NULL) {
+				bus_dmamap_unload(sc->sc_mbuf_dtag, 
+			  	    rb->rb_dmap);
 				m_freem(rb->rb_mbuf);
 				rb->rb_mbuf = NULL;
 			}