diff --git a/firmware/debug.c b/firmware/debug.c
index 7bc0f3eb00..5cd1f15a38 100644
--- a/firmware/debug.c
+++ b/firmware/debug.c
@@ -94,7 +94,6 @@ static char lowhex(int  x)
 static void putpacket (char *buffer)
 {
     register  int checksum;
-    char ch;
 
     char *src = buffer;