diff --git a/ptbletter/ptbletter.cls b/ptbletter/ptbletter.cls
index 3c1da51c20f7781e4375db4927fcd11523cd2c79..faa6044720ccec1d292c8d9b550fc8bab1010da8 100644
--- a/ptbletter/ptbletter.cls
+++ b/ptbletter/ptbletter.cls
@@ -95,7 +95,7 @@
 % Ohne Sprachangabe "deutsch" verwenden. Bessere Lösung?
 
 \RequirePackage[\ptb@lang]{babel}
-\RequirePackage{etoolbox,iflang}
+\RequirePackage{etoolbox,iflang,trimspaces}
 \AtEndPreamble{%
   \IfLanguageName{ngerman}{
     \RequirePackage[babel=once,german=guillemets]{csquotes}