diff --git a/avr-code/main.c b/avr-code/main.c
index ec6ec2a..b3eb8a2 100644
--- a/avr-code/main.c
+++ b/avr-code/main.c
@@ -95,7 +95,7 @@ static void set_leds(void)
 
 static void update_state(unsigned char new_state, enum state_source source)
 {
-	char ret;
+	char ret = 0;
 	reset_timeout();
 
 	if (new_state == state)