diff --git a/ptbposter/ptbposter.cls b/ptbposter/ptbposter.cls
index 1abaff423748f80bfc7f2d8965899341f722e611..1565d108d426839fe360ebc5f7611d6257e7e1a9 100644
--- a/ptbposter/ptbposter.cls
+++ b/ptbposter/ptbposter.cls
@@ -3,7 +3,7 @@
 \setcounter{errorcontextlines}{100}  \listfiles
 
 \NeedsTeXFormat{LaTeX2e}[1999/12/01]
-\ProvidesClass{ptbposter}[2019/06/25 v0.9c PTB-Poster (RN)]
+\ProvidesClass{ptbposter}[2019/06/26 v0.9c PTB-Poster (RN)]
     
 \newif\ifPTB@useCMYK \PTB@useCMYKfalse % vorerst 
 \newif\ifPTB@german@  \PTB@german@true
@@ -88,6 +88,9 @@
 \DeclareOption{a1paper}{%
   \PassOptionsToPackage{\CurrentOption}{geometry}
 }
+\DeclareOption{a0paper}{%
+  \PassOptionsToPackage{\CurrentOption}{geometry}
+}
 \DeclareOption*{\PassOptionsToPackage{\CurrentOption}{babel}}
 \ExecuteOptions{serif}
 \ProcessOptions\relax