diff --git a/pycardium/modules/sys_leds.c b/pycardium/modules/sys_leds.c
index 13924aef0d3a48cc7500c1b935c4e3963929c1d0..302c356ec0198d4652dd1463920bc5b9f77272a7 100644
--- a/pycardium/modules/sys_leds.c
+++ b/pycardium/modules/sys_leds.c
@@ -221,7 +221,7 @@ mp_leds_blink_rocket(mp_obj_t led_in, mp_obj_t value_in, mp_obj_t time_in)
 	int time  = mp_obj_get_int(time_in);
 
 	if (value > 31) {
-		mp_raise_ValueError("brightness must by < 32");
+		mp_raise_ValueError("brightness must be < 32");
 	}
 
 	epic_leds_blink_rocket(led, value, time);