diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 3dcf6745..0b56b0d2 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -1120,6 +1120,7 @@ Rolf Ahrenberg <rahrenbe@cc.hut.fi>
  for fixing handling DVB subtitles and implementing decoding textual DVB subtitles
  for adding file name and line number to LOG_ERROR_STR()
  for replacing all calls to sleep() with cCondWait::SleepMs()
+ for fixing cDvbSubtitleConverter::SetOsdData()
 
 Ralf Klueber <ralf.klueber@vodafone.com>
  for reporting a bug in cutting a recording if there is only a single editing mark
diff --git a/HISTORY b/HISTORY
index 353662cd..f6991d8d 100644
--- a/HISTORY
+++ b/HISTORY
@@ -6781,7 +6781,7 @@ Video Disk Recorder Revision History
 - Replaced all calls to sleep() with cCondWait::SleepMs() (thanks to Rolf Ahrenberg).
 - Fixed a crash with malformed SI data (patch from vdr-portal).
 
-2012-01-07: Version 1.7.23
+2012-01-11: Version 1.7.23
 
 - Removed the '.pl' suffix from svdrpsend.pl (sorry, I missed that one).
 - Fixed bonding more than two devices.
@@ -6806,3 +6806,4 @@ Video Disk Recorder Revision History
 - cEvent::FixEpgBugs() now replaces any newline characters in stream component
   descriptions with blanks (thanks to Torsten Lang for reporting a problem with
   EPG data from BSkyB's "MTV MUSIC", S28.2E-2-2010-7012).
+- Fixed cDvbSubtitleConverter::SetOsdData() (thanks to Rolf Ahrenberg).
diff --git a/dvbsubtitle.c b/dvbsubtitle.c
index 272950fa..c29277dd 100644
--- a/dvbsubtitle.c
+++ b/dvbsubtitle.c
@@ -7,7 +7,7 @@
  * Original author: Marco Schlüßler <marco@lordzodiac.de>
  * With some input from the "subtitle plugin" by Pekka Virtanen <pekka.virtanen@sci.fi>
  *
- * $Id: dvbsubtitle.c 2.20 2011/09/18 11:23:15 kls Exp $
+ * $Id: dvbsubtitle.c 2.21 2012/01/11 10:34:07 kls Exp $
  */
 
 
@@ -995,7 +995,7 @@ void cDvbSubtitleConverter::SetOsdData(void)
   double VideoAspect;
   cDevice::PrimaryDevice()->GetOsdSize(OsdWidth, OsdHeight, OsdAspect);
   cDevice::PrimaryDevice()->GetVideoSize(VideoWidth, VideoHeight, VideoAspect);
-  if (OsdWidth == displayWidth && OsdHeight == displayHeight || VideoWidth == 0) {
+  if (OsdWidth == displayWidth && OsdHeight == displayHeight || DoubleEqual(VideoAspect, 1.0)) {
      osdFactorX = osdFactorY = 1.0;
      osdDeltaX = osdDeltaY = 0;
      }