diff --git a/firmware/input.c b/firmware/input.c
index afa0b6b..62417f8 100644
--- a/firmware/input.c
+++ b/firmware/input.c
@@ -59,7 +59,6 @@ void input_proc_switches()
 	uint8_t ev;
 	uint8_t i;
 	static uint8_t sw_last = 0xFF;
-	uint8_t delta;
 
 	sw = PORT_KEYPAD(PIN) & PIN_KEYPAD_MASK;
 	ev = sw ^ sw_last;