diff --git a/backend/telepen.c b/backend/telepen.c
index 4a6740d7..744c102f 100644
--- a/backend/telepen.c
+++ b/backend/telepen.c
@@ -26,7 +26,7 @@
 #include <stdlib.h>
 #include "common.h"
 
-static char *TeleTable[128] = {	"1111111111111111", "1131313111", "33313111", "1111313131",
+static char *TeleTable[] = {	"1111111111111111", "1131313111", "33313111", "1111313131",
 	"3111313111", "11333131", "13133131", "111111313111", "31333111", "1131113131", "33113131",
 	"1111333111", "3111113131", "1113133111", "1311133111", "111111113131", "3131113111",
 	"11313331", "333331", "111131113111", "31113331", "1133113111", "1313113111", "1111113331",
@@ -89,6 +89,7 @@ int telepen(struct zint_symbol *symbol, unsigned char source[])
 	}
 
 	check_digit = 127 - (count % 127);
+	if(check_digit == 127) { check_digit = 0; }
 	concat(dest, TeleTable[check_digit]);
 
 	/* Stop character */
@@ -162,6 +163,7 @@ int telepen_num(struct zint_symbol *symbol, unsigned char source[])
 	}
 
 	check_digit = 127 - (count % 127);
+	if(check_digit == 127) { check_digit = 0; }
 	concat((char*)dest, TeleTable[check_digit]);
 
 	/* Stop character */