diff --git a/HISTORY b/HISTORY
index 9523a98e..05247763 100644
--- a/HISTORY
+++ b/HISTORY
@@ -9007,3 +9007,5 @@ Video Disk Recorder Revision History
 - Fixed a memory leak in cSectionSyncerHash. The cSectionSyncerEntry objects put into
   the hash were never explicitly deleted. Now the cSectionSyncerHash takes ownership of
   these objects.
+- cListObject now implements a private copy constructor and assignment operator, to keep
+  derived objects from calling them implicitly.
diff --git a/filter.c b/filter.c
index aa91c1f1..742041a7 100644
--- a/filter.c
+++ b/filter.c
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: filter.c 4.2 2015/07/25 10:59:57 kls Exp $
+ * $Id: filter.c 4.3 2017/05/09 08:37:23 kls Exp $
  */
 
 #include "filter.h"
@@ -71,6 +71,15 @@ cFilterData::cFilterData(u_short Pid, u_char Tid, u_char Mask, bool Sticky)
   sticky = Sticky;
 }
 
+cFilterData& cFilterData::operator= (const cFilterData &FilterData)
+{
+  pid = FilterData.pid;
+  tid = FilterData.tid;
+  mask = FilterData.mask;
+  sticky = FilterData.sticky;
+  return *this;
+}
+
 bool cFilterData::Is(u_short Pid, u_char Tid, u_char Mask)
 {
   return pid == Pid && tid == Tid && mask == Mask;
diff --git a/filter.h b/filter.h
index 7cc3ec32..b8198345 100644
--- a/filter.h
+++ b/filter.h
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: filter.h 4.2 2015/07/25 10:03:44 kls Exp $
+ * $Id: filter.h 4.3 2017/05/09 08:37:23 kls Exp $
  */
 
 #ifndef __FILTER_H
@@ -38,6 +38,7 @@ public:
   bool sticky;
   cFilterData(void);
   cFilterData(u_short Pid, u_char Tid, u_char Mask, bool Sticky);
+  cFilterData& operator= (const cFilterData &FilterData);
   bool Is(u_short Pid, u_char Tid, u_char Mask);
   bool Matches(u_short Pid, u_char Tid);
   };
diff --git a/tools.h b/tools.h
index 7941da5d..3bd7f9d2 100644
--- a/tools.h
+++ b/tools.h
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: tools.h 4.7 2017/05/09 08:33:37 kls Exp $
+ * $Id: tools.h 4.8 2017/05/09 08:37:23 kls Exp $
  */
 
 #ifndef __TOOLS_H
@@ -479,6 +479,8 @@ class cListObject {
   friend class cListGarbageCollector;
 private:
   cListObject *prev, *next;
+  cListObject(const cListObject &ListObject) { abort(); } // no copy constructor!
+  cListObject& operator= (const cListObject &ListObject) { abort(); return *this; } // no assignment operator!
 public:
   cListObject(void);
   virtual ~cListObject();