diff --git a/HISTORY b/HISTORY
index d1b1b1ee..338d0129 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).
 
-2012-01-12: Version 1.7.23
+2012-01-14: Version 1.7.23
 
 - Removed the '.pl' suffix from svdrpsend.pl (sorry, I missed that one).
 - Fixed bonding more than two devices.
@@ -6825,3 +6825,4 @@ Video Disk Recorder Revision History
 - The parameters that are only used by "second generation" delivery systems (DVB-S2
   and DVB-T2) are no longer written into channels.conf for "first generation"
   delivery systems (DVB-S and DVB-T).
+- Changed IndexToHMSF() so that it can handle negative Index values.
diff --git a/recording.c b/recording.c
index 698b2db0..cb4918e3 100644
--- a/recording.c
+++ b/recording.c
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: recording.c 2.41 2011/12/10 14:22:37 kls Exp $
+ * $Id: recording.c 2.42 2012/01/14 12:50:58 kls Exp $
  */
 
 #include "recording.h"
@@ -2035,15 +2035,18 @@ cUnbufferedFile *cFileName::NextFile(void)
 
 cString IndexToHMSF(int Index, bool WithFrame, double FramesPerSecond)
 {
-  char buffer[16];
+  const char *Sign = "";
+  if (Index < 0) {
+     Index = -Index;
+     Sign = "-";
+     }
   double Seconds;
   int f = int(modf((Index + 0.5) / FramesPerSecond, &Seconds) * FramesPerSecond + 1);
   int s = int(Seconds);
   int m = s / 60 % 60;
   int h = s / 3600;
   s %= 60;
-  snprintf(buffer, sizeof(buffer), WithFrame ? "%d:%02d:%02d.%02d" : "%d:%02d:%02d", h, m, s, f);
-  return buffer;
+  return cString::sprintf(WithFrame ? "%s%d:%02d:%02d.%02d" : "%s%d:%02d:%02d", Sign, h, m, s, f);
 }
 
 int HMSFToIndex(const char *HMSF, double FramesPerSecond)