diff --git a/ptbletter/ptbletter.cls b/ptbletter/ptbletter.cls
index a2ff03ad22c688cfe46ded5394523dca7d99c8ca..446eefb2f70085cb5c37b8908f1f91ca58a98a61 100644
--- a/ptbletter/ptbletter.cls
+++ b/ptbletter/ptbletter.cls
@@ -300,7 +300,7 @@
   english,newzealand,UKenglish,USenglish}\handledbyname{Handled by}%
 
 \defcaptionname{german,ngerman,austrian,naustrian,%
-  swissgerman,nswissgerman}\yourmailname{Ihr Zeichen}%
+  swissgerman,nswissgerman}\yourrefname{Ihr Zeichen}%
 \defcaptionname{german,ngerman,austrian,naustrian,%
   swissgerman,nswissgerman}\yourmailname{Ihre Nachricht vom}%
 \defcaptionname{german,ngerman,austrian,naustrian,%