diff --git a/ptbposter/ptbposter.cls b/ptbposter/ptbposter.cls
index 46c59c67abca7fac019a94d7abebc31882f1a314..0cafc8bbf679892a5138dca77300ae281914ef33 100644
--- a/ptbposter/ptbposter.cls
+++ b/ptbposter/ptbposter.cls
@@ -57,6 +57,8 @@
 
 \DeclareOption*{\PassOptionsToClass{\CurrentOption}{scrartcl}}
 
+\PassOptionsToPackage{pagesize=false}{typearea}
+
 \ExecuteOptions{portrait,serif}
 \ProcessOptions\relax