diff --git a/sys/alpha/alpha/busdma_machdep.c b/sys/alpha/alpha/busdma_machdep.c
index e540e1c99b9..d743e8da1d0 100644
--- a/sys/alpha/alpha/busdma_machdep.c
+++ b/sys/alpha/alpha/busdma_machdep.c
@@ -397,6 +397,7 @@ bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map)
 	if (map != NULL && map != &nobounce_dmamap) {
 		if (STAILQ_FIRST(&map->bpages) != NULL)
 			return (EBUSY);
+		free(map, M_DEVBUF);
 	}
 	dmat->map_count--;
 	return (0);