diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 491a0fd2..a280fdc5 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -1241,6 +1241,7 @@ Marco Schl
  for fixing detecting short channel names for "Kabel Deutschland"
  for reporting that the FATALERRNO macro needs to check for a non-zero errno value
  for reporting missing mutex locks in cCiMenu::Abort() and cCiEnquiry::Abort()
+ for fixing a race condition in the SPU decoder
 
 Jürgen Schmitz <j.schmitz@web.de>
  for reporting a bug in displaying the current channel when switching via the SVDRP
diff --git a/HISTORY b/HISTORY
index 013b3e72..a91667ad 100644
--- a/HISTORY
+++ b/HISTORY
@@ -3933,3 +3933,4 @@ Video Disk Recorder Revision History
   commands of any length. The MAXPARSEBUFFER macros is now obsolete and has
   been removed. If a plugin has used that macro, it should either define
   a buffer size of its own, or use cReadLine when reading files.
+- Fixed a race condition in the SPU decoder (thanks to Marco Schlüßler).
diff --git a/dvbspu.c b/dvbspu.c
index f9a1df41..9887cc05 100644
--- a/dvbspu.c
+++ b/dvbspu.c
@@ -8,7 +8,7 @@
  *
  * parts of this file are derived from the OMS program.
  *
- * $Id: dvbspu.c 1.16 2005/11/04 14:19:07 kls Exp $
+ * $Id: dvbspu.c 1.17 2005/11/05 12:08:15 kls Exp $
  */
 
 #include <assert.h>
@@ -338,6 +338,7 @@ sDvbSpuRect cDvbSpuDecoder::CalcAreaSize(sDvbSpuRect fgsize, cBitmap *fgbmp, sDv
 
 void cDvbSpuDecoder::Draw(void)
 {
+    cMutexLock MutexLock(&mutex);
     if (!spubmp) {
         Hide();
         return;
@@ -390,6 +391,7 @@ void cDvbSpuDecoder::Draw(void)
 
 void cDvbSpuDecoder::Hide(void)
 {
+    cMutexLock MutexLock(&mutex);
     delete osd;
     osd = NULL;
 }
diff --git a/dvbspu.h b/dvbspu.h
index 8a7d9051..e018c702 100644
--- a/dvbspu.h
+++ b/dvbspu.h
@@ -8,7 +8,7 @@
  *
  * parts of this file are derived from the OMS program.
  *
- * $Id: dvbspu.h 1.9 2005/05/07 11:14:03 kls Exp $
+ * $Id: dvbspu.h 1.10 2005/11/05 12:08:47 kls Exp $
  */
 
 #ifndef __DVBSPU_H
@@ -91,7 +91,8 @@ class cDvbSpuBitmap {
 
 class cDvbSpuDecoder:public cSpuDecoder {
   private:
-    cOsd * osd;
+    cOsd *osd;
+    cMutex mutex;
 
     // processing state
     uint8_t *spu;