diff -urN ../exim-4.89.1.orig/src/match.c ./src/match.c
--- ../exim-4.89.1.orig/src/match.c	2017-11-28 23:40:59.000000000 +0200
+++ ./src/match.c	2017-12-03 20:39:23.675415000 +0200
@@ -448,7 +448,7 @@
 const uschar *list;
 uschar *sss;
 uschar *ot = NULL;
-uschar buffer[1024];
+uschar buffer[2048];
 
 /* Save time by not scanning for the option name when we don't need it. */