diff --git a/ptbposter/ptbposter.cls b/ptbposter/ptbposter.cls
index d295b8149b2f41bb3690d945372cfa2418f4ffb8..4a7009f88394aaa57f282fa8534be3abc4a69d60 100644
--- a/ptbposter/ptbposter.cls
+++ b/ptbposter/ptbposter.cls
@@ -76,6 +76,18 @@
 \DeclareOption{centerAuthors}{%
   \global\let\PTB@authors@justification=\centering
 }
+\DeclareOption{a4paper}{%
+  \PassOptionsToPackage{\CurrentOption}{geometry}
+}
+\DeclareOption{a3paper}{%
+  \PassOptionsToPackage{\CurrentOption}{geometry}
+}
+\DeclareOption{a2paper}{%
+  \PassOptionsToPackage{\CurrentOption}{geometry}
+}
+\DeclareOption{a1paper}{%
+  \PassOptionsToPackage{\CurrentOption}{geometry}
+}
 \DeclareOption*{\PassOptionsToPackage{\CurrentOption}{babel}}
 \ExecuteOptions{serif}
 \ProcessOptions\relax