diff --git a/include/wx/fileconf.h b/include/wx/fileconf.h
index 911c7bbd0a..f67f290dfb 100644
--- a/include/wx/fileconf.h
+++ b/include/wx/fileconf.h
@@ -158,7 +158,7 @@ public:
   virtual bool RenameEntry(const wxString& oldName, const wxString& newName);
   virtual bool RenameGroup(const wxString& oldName, const wxString& newName);
 
-  virtual bool DeleteEntry(const wxString& key, bool bGroupIfEmptyAlso);
+  virtual bool DeleteEntry(const wxString& key, bool bGroupIfEmptyAlso = TRUE);
   virtual bool DeleteGroup(const wxString& szKey);
   virtual bool DeleteAll();
 
diff --git a/include/wx/msw/iniconf.h b/include/wx/msw/iniconf.h
index 4fa4405a6d..22e141149e 100644
--- a/include/wx/msw/iniconf.h
+++ b/include/wx/msw/iniconf.h
@@ -70,7 +70,7 @@ public:
   virtual bool RenameEntry(const wxString& oldName, const wxString& newName);
   virtual bool RenameGroup(const wxString& oldName, const wxString& newName);
 
-  virtual bool DeleteEntry(const wxString& Key, bool bGroupIfEmptyAlso);
+  virtual bool DeleteEntry(const wxString& Key, bool bGroupIfEmptyAlso = TRUE);
   virtual bool DeleteGroup(const wxString& szKey);
   virtual bool DeleteAll();
 
diff --git a/include/wx/msw/regconf.h b/include/wx/msw/regconf.h
index dc33f73841..960d098f82 100644
--- a/include/wx/msw/regconf.h
+++ b/include/wx/msw/regconf.h
@@ -70,7 +70,7 @@ public:
   virtual bool RenameGroup(const wxString& oldName, const wxString& newName);
 
   // delete
-  virtual bool DeleteEntry(const wxString& key, bool bGroupIfEmptyAlso);
+  virtual bool DeleteEntry(const wxString& key, bool bGroupIfEmptyAlso = TRUE);
   virtual bool DeleteGroup(const wxString& key);
   virtual bool DeleteAll();