diff --git a/backend/postal.c b/backend/postal.c
--- a/backend/postal.c
+++ b/backend/postal.c
@@ -363,7 +363,7 @@
/* Handles Dutch Post TNT KIX symbols */
/* The same as RM4SCC but without check digit */
/* Specification at http://www.tntpost.nl/zakelijk/klantenservice/downloads/kIX_code/download.aspx */
- char height_pattern[50], localstr[20];
+ char height_pattern[256], localstr[20];
unsigned int loopey;
int writer, i, h;
int error_number; /* zeroes; */