diff --git a/MoinMoin/action/RenderAsOpenDocument.py b/MoinMoin/action/RenderAsOpenDocument.py
index c7ccbdc..e431bf0 100644
--- a/MoinMoin/action/RenderAsOpenDocument.py
+++ b/MoinMoin/action/RenderAsOpenDocument.py
@@ -606,7 +606,7 @@ xmlns:xlink="http://www.w3.org/1999/xlink"/>"""
     # Note that RuntimeErrors create their one headers and pages and thus should come before this: Now's too late
     # for HTML-Error pages.
     request.headers.add('Content-Type','application/vnd.oasis.opendocument.text')
-    request.headers.add('Content-Disposition: attachment','filename="%s"'  % (filenameASCII))
+    request.headers.add('Content-Disposition','attachment; filename="%s"' % (filenameASCII))
 
     # send data (without 'rb' the windows version doesn't work at all!)
     shutil.copyfileobj( open( pathToZIP, 'rb' ), request, 8192 )