diff --git a/sys/powerpc/psim/iobus.c b/sys/powerpc/psim/iobus.c
index 497ef42d82e..c572a1fdc12 100644
--- a/sys/powerpc/psim/iobus.c
+++ b/sys/powerpc/psim/iobus.c
@@ -352,7 +352,8 @@ iobus_adjust_resource(device_t bus, device_t child, int type,
 		return (bus_generic_rman_adjust_resource(bus, child, type, r,
 		    start, end));
 	case SYS_RES_IRQ:
-		return (bus_adjust_resource(bus, type, r, start, end));
+		return (bus_generic_adjust_resource(bus, child, type, r, start,
+		    end));
 	default:
 		return (EINVAL);
 	}