--- Firebird-2.1.3.18185-0/extern/btyacc/main.c.orig	2006-04-29 02:29:46.000000000 +0200
+++ Firebird-2.1.3.18185-0/extern/btyacc/main.c	2010-08-29 08:33:44.738817429 +0200
@@ -300,7 +300,7 @@
 		tmpdir = DEFAULT_TMPDIR;
 
 	len = strlen(tmpdir);
-	i = len + 13;
+	i = len + 14; /* add len of temp_form + one for NUL */
 	if (len && tmpdir[len-1] != DIR_CHAR)
 		++i;