diff --git a/sys/dev/ep/if_ep_mca.c b/sys/dev/ep/if_ep_mca.c
index 5bdcb2472641..8c7d85cd5467 100644
--- a/sys/dev/ep/if_ep_mca.c
+++ b/sys/dev/ep/if_ep_mca.c
@@ -129,7 +129,7 @@ ep_mca_attach(device_t dev)
 	ep_get_media(sc);
 
 	GO_WINDOW(0);
-	SET_IRQ(BASE, rman_get_start(sc->irq));
+	SET_IRQ(sc, rman_get_start(sc->irq));
 
 	if ((error = ep_attach(sc))) {
 		device_printf(dev, "ep_attach() failed! (%d)\n", error);