diff --git a/sys/arm/ti/am335x/am335x_dmtimer.c b/sys/arm/ti/am335x/am335x_dmtimer.c
--- a/sys/arm/ti/am335x/am335x_dmtimer.c
+++ b/sys/arm/ti/am335x/am335x_dmtimer.c
@@ -275,7 +275,7 @@
 			return (ENXIO);
 	}
 
-	device_set_descf("AM335x DMTimer%d", tmr_num);
+	device_set_descf(dev, "AM335x DMTimer%d", tmr_num);
 
 	return(BUS_PROBE_DEFAULT);
 }