diff --git a/sys/sparc64/pci/psycho.c b/sys/sparc64/pci/psycho.c
index a7ad9d3b96e7..f7f4c40e389c 100644
--- a/sys/sparc64/pci/psycho.c
+++ b/sys/sparc64/pci/psycho.c
@@ -664,7 +664,7 @@ psycho_set_intr(struct psycho_softc *sc, u_int index, bus_addr_t intrmap,
 	    INTVEC(PSYCHO_READ8(sc, intrmap)) != vec ||
 	    intr_vectors[vec].iv_ic != &psycho_ic ||
 	    bus_setup_intr(sc->sc_dev, sc->sc_irq_res[index],
-	    INTR_TYPE_MISC | INTR_BRIDGE, filt, intr, sc,
+	    INTR_TYPE_MISC | INTR_BRIDGE | INTR_MPSAFE, filt, intr, sc,
 	    &sc->sc_ihand[index]) != 0)
 		panic("%s: failed to set up interrupt %d", __func__, index);
 }