diff --git a/drivers/avr/system.h b/drivers/avr/system.h
index 7afbebf..aa5eb50 100644
--- a/drivers/avr/system.h
+++ b/drivers/avr/system.h
@@ -51,6 +51,7 @@ typedef uint8_t bool;
 
 /* Navswitch.  */
 #define NAVSWITCH_PUSH_PIO LEDMAT_COL3_PIO
+#define NAVSWITCH_DOWN_PIO NAVSWITCH_PUSH_PIO 
 #define NAVSWITCH_EAST_PIO LEDMAT_COL1_PIO
 #define NAVSWITCH_WEST_PIO LEDMAT_COL2_PIO
 #define NAVSWITCH_NORTH_PIO LEDMAT_COL4_PIO