diff --git a/avr/main.c b/avr/main.c
index 4ece5aa..dd723d9 100644
--- a/avr/main.c
+++ b/avr/main.c
@@ -16,8 +16,6 @@ static volatile tabby_printer_packet_header header = {
     .size        = 0
 };
 
-static volatile uint16_t sum = 0;
-
 static volatile uint16_t i = 0,
                          b = 0;