--- filters/spellflt.l.orig	2019-06-18 20:52:50.319683010 +0200
+++ filters/spellflt.l	2019-06-18 20:52:57.775940688 +0200
@@ -157,7 +157,8 @@
 
 %}
 
-WORD		[[:alpha:]]([[:alnum:]])*
+/* WORD		[[:alpha:]]([[:alnum:]])* */
+WORD		([a-zA-Z]|\xc3[\x80-\xbf])+
 
 %%