From 2455b24d351acdc87d4e2e06e61a832e4f1784d8 Mon Sep 17 00:00:00 2001
From: niepra01 <rolf.niepraschk@ptb.de>
Date: Fri, 1 Dec 2017 10:51:18 +0100
Subject: [PATCH] ...

---
 ptbletter/ptbletter.cls | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ptbletter/ptbletter.cls b/ptbletter/ptbletter.cls
index 7dc2d3c..5377d7b 100644
--- a/ptbletter/ptbletter.cls
+++ b/ptbletter/ptbletter.cls
@@ -122,6 +122,8 @@
 \defineshorthand{"'}{\closeautoquote}
 \AtEndOfClass{\shorthandon{"}}
 
+\RequirePackage{amsmath,siunitx-PTB}
+
 \@setplength{toaddrhpos}{72bp}
 \@setplength{toaddrvpos}{124bp}
 %\@setplength{toaddrwidth}{85mm}
-- 
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