diff --git a/include/wx/generic/listctrl.h b/include/wx/generic/listctrl.h
index 774b20a7a3..8efc002910 100644
--- a/include/wx/generic/listctrl.h
+++ b/include/wx/generic/listctrl.h
@@ -115,9 +115,9 @@ public:
     bool IsItemChecked(long item) const wxOVERRIDE;
     void CheckItem(long item, bool check) wxOVERRIDE;
 
-    void EnableSortIndicator(const bool enable = true) wxOVERRIDE;
+    void EnableSortIndicator(bool enable = true) wxOVERRIDE;
     bool IsSortIndicatorEnabled() const wxOVERRIDE;
-    void ShowSortIndicator(const int idx, const bool ascending = true) wxOVERRIDE;
+    void ShowSortIndicator(int idx, bool ascending = true) wxOVERRIDE;
     void RemoveSortIndicator() wxOVERRIDE;
     int GetSortIndicator() const wxOVERRIDE;
     bool IsAscendingSortIndicator() const wxOVERRIDE;
diff --git a/include/wx/listbase.h b/include/wx/listbase.h
index ce4fc2aedb..32ab9aeb3a 100644
--- a/include/wx/listbase.h
+++ b/include/wx/listbase.h
@@ -447,9 +447,9 @@ public:
     virtual void CheckItem(long WXUNUSED(item), bool WXUNUSED(check)) { }
 
     // Sort indicator in header.
-    virtual void EnableSortIndicator(const bool WXUNUSED(enable) = true) { }
+    virtual void EnableSortIndicator(bool WXUNUSED(enable) = true) { }
     virtual bool IsSortIndicatorEnabled() const { return false; }
-    virtual void ShowSortIndicator(const int WXUNUSED(idx), const bool WXUNUSED(ascending) = true) { }
+    virtual void ShowSortIndicator(int WXUNUSED(idx), bool WXUNUSED(ascending) = true) { }
     virtual void RemoveSortIndicator() { }
     virtual int GetSortIndicator() const { return -1; }
     virtual bool IsAscendingSortIndicator() const { return true; }
diff --git a/include/wx/msw/listctrl.h b/include/wx/msw/listctrl.h
index 2314133ff4..02e891353e 100644
--- a/include/wx/msw/listctrl.h
+++ b/include/wx/msw/listctrl.h
@@ -226,9 +226,9 @@ public:
     void CheckItem(long item, bool check) wxOVERRIDE;
 
     // Sort indicator in header
-    void EnableSortIndicator(const bool enable = true) wxOVERRIDE;
+    void EnableSortIndicator(bool enable = true) wxOVERRIDE;
     bool IsSortIndicatorEnabled() const wxOVERRIDE;
-    void ShowSortIndicator(const int idx, const bool ascending = true) wxOVERRIDE;
+    void ShowSortIndicator(int idx, bool ascending = true) wxOVERRIDE;
     void RemoveSortIndicator() wxOVERRIDE;
     int GetSortIndicator() const wxOVERRIDE;
     bool IsAscendingSortIndicator() const wxOVERRIDE;
diff --git a/interface/wx/listctrl.h b/interface/wx/listctrl.h
index bc6c1ac9a4..1fb82c5f9d 100644
--- a/interface/wx/listctrl.h
+++ b/interface/wx/listctrl.h
@@ -1435,7 +1435,7 @@ public:
 
         @since 3.1.6
     */
-    void EnableSortIndicator(const bool enable);
+    void EnableSortIndicator(bool enable);
 
     /**
         Returns true if a sort indicator is enabled.
@@ -1462,7 +1462,7 @@ public:
 
         @since 3.1.6
     */
-    void ShowSortIndicator(const int idx, const bool ascending = true);
+    void ShowSortIndicator(int idx, bool ascending = true);
 
     /**
         Remove the sort indicator from the column being used as sort key.
diff --git a/src/generic/listctrl.cpp b/src/generic/listctrl.cpp
index 1e078b9f9a..2e9d868d5a 100644
--- a/src/generic/listctrl.cpp
+++ b/src/generic/listctrl.cpp
@@ -5084,7 +5084,7 @@ bool wxGenericListCtrl::IsItemChecked(long item) const
     return m_mainWin->IsItemChecked(item);
 }
 
-void wxGenericListCtrl::EnableSortIndicator(const bool enable)
+void wxGenericListCtrl::EnableSortIndicator(bool enable)
 {
     if ( m_headerWin )
     {
@@ -5098,7 +5098,7 @@ bool wxGenericListCtrl::IsSortIndicatorEnabled() const
     return m_headerWin && m_headerWin->m_enableSortCol;
 }
 
-void wxGenericListCtrl::ShowSortIndicator(const int idx, const bool ascending)
+void wxGenericListCtrl::ShowSortIndicator(int idx, bool ascending)
 {
     if ( idx == -1 )
     {
diff --git a/src/msw/listctrl.cpp b/src/msw/listctrl.cpp
index 82900b7c96..283b8b6b5b 100644
--- a/src/msw/listctrl.cpp
+++ b/src/msw/listctrl.cpp
@@ -1456,7 +1456,7 @@ bool wxListCtrl::IsItemChecked(long item) const
     return ListView_GetCheckState(GetHwnd(), (UINT)item) != 0;
 }
 
-void wxListCtrl::EnableSortIndicator(const bool enable)
+void wxListCtrl::EnableSortIndicator(bool enable)
 {
     m_enableSortCol = enable;
     DrawSortArrow();
@@ -1467,7 +1467,7 @@ bool wxListCtrl::IsSortIndicatorEnabled() const
     return m_enableSortCol;
 }
 
-void wxListCtrl::ShowSortIndicator(const int idx, const bool ascending)
+void wxListCtrl::ShowSortIndicator(int idx, bool ascending)
 {
     if ( idx == -1 )
     {