diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index e8cd8dd8..ed8ca4fa 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -2772,6 +2772,7 @@ Winfried K
  cFileName::SetOffset()
  for adding initialization of cDvbFrontend::frontendInfo
  for improving handling missing VDRPluginDestroyer()
+ for fixing a compiler warning
 
 Hans-Werner Hilse <hilse@web.de>
  for adding the command line option --userdump to enable core dumps in case VDR
diff --git a/HISTORY b/HISTORY
index 0378a1f3..f110848d 100644
--- a/HISTORY
+++ b/HISTORY
@@ -9536,7 +9536,7 @@ Video Disk Recorder Revision History
   cDvbTuner::GetSignalStats() to avoid problems with drivers that don't do this
   (thanks to Helmut Binder).
 
-2020-12-17:
+2020-12-18:
 
 - Fixed multiple recording entries in case a recording is started during the initial
   reading of the video directory (reported by Claus Muus).
@@ -9559,3 +9559,4 @@ Video Disk Recorder Revision History
 - Improved handling missing VDRPluginDestroyer() (thanks to Winfried Köhler).
 - Fixed initializing tmpbuf in ExtendedEventDescriptors::getText() (thanks to Helmut
   Binder).
+- Fixed a compiler warning (thanks to Winfried Köhler).
diff --git a/dvbspu.c b/dvbspu.c
index 6b3c2162..a277f425 100644
--- a/dvbspu.c
+++ b/dvbspu.c
@@ -8,7 +8,7 @@
  *
  * parts of this file are derived from the OMS program.
  *
- * $Id: dvbspu.c 2.11 2013/02/22 15:25:16 kls Exp $
+ * $Id: dvbspu.c 4.1 2020/12/18 14:51:57 kls Exp $
  */
 
 #include "dvbspu.h"
@@ -38,7 +38,7 @@
 #ifdef SPUDEBUG
 #define DEBUG(format, args...) printf (format, ## args)
 #else
-#define DEBUG(format, args...)
+#define DEBUG(format, args...) void()
 #endif
 
 // --- cDvbSpuPalette---------------------------------------------------------
diff --git a/pat.c b/pat.c
index 4b320245..72164c49 100644
--- a/pat.c
+++ b/pat.c
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: pat.c 4.8 2020/12/12 10:31:52 kls Exp $
+ * $Id: pat.c 4.9 2020/12/18 14:51:57 kls Exp $
  */
 
 #include "pat.h"
@@ -334,7 +334,7 @@ cPmtSidEntry::cPmtSidEntry(int Sid, int Pid, cPmtPidEntry *PidEntry)
 #ifdef DEBUG_PAT_PMT
 #define DBGLOG(a...) { cString s = cString::sprintf(a); fprintf(stderr, "%s\n", *s); dsyslog("%s", *s); }
 #else
-#define DBGLOG(a...)
+#define DBGLOG(a...) void()
 #endif
 
 cPatFilter::cPatFilter(void)