--- barcode-0.99/plessey.c.orig 2014-05-04 13:23:01.392919441 +0300 +++ barcode-0.99/plessey.c 2014-05-04 13:24:55.204785523 +0300 @@ -149,7 +149,7 @@ checkptr[i+j] ^= check[j]; } for (i = 0; i < 8; i++) { - sprintf(ptr, patterns[checkptr[strlen(text) * 4 + i]]); + sprintf(ptr, "%s", patterns[checkptr[strlen(text) * 4 + i]]); ptr += 2; } fprintf(stderr, _("CRC: "));