diff --git a/sys/arm/at91/at91.c b/sys/arm/at91/at91.c
index a3f9556f5a00..6deee422cfd6 100644
--- a/sys/arm/at91/at91.c
+++ b/sys/arm/at91/at91.c
@@ -231,8 +231,7 @@ at91_probe(device_t dev)
 {
 
 	device_set_desc(dev, "AT91 device bus");
-	arm_post_filter = at91_eoi;
-	return (0);
+	return (BUS_PROBE_NO_WILDCARD);
 }
 
 static void
@@ -261,6 +260,8 @@ at91_attach(device_t dev)
 	const struct pmap_devmap *pdevmap;
 	int i;
 
+	arm_post_filter = at91_eoi;
+
 	at91_softc = sc;
 	sc->sc_st = &at91_bs_tag;
 	sc->sc_sh = AT91_BASE;