diff --git a/include/wx/msw/taskbar.h b/include/wx/msw/taskbar.h
index d36e055b5c..2d056d574e 100644
--- a/include/wx/msw/taskbar.h
+++ b/include/wx/msw/taskbar.h
@@ -54,8 +54,7 @@ public:
 // Implementation
 protected:
     friend class wxTaskBarIconWindow;
-    long WindowProc(WXHWND hWnd, unsigned int msg,
-                    unsigned int wParam, long lParam);
+    long WindowProc(unsigned int msg, unsigned int wParam, long lParam);
     void RegisterWindowMessages();
 
 // Data members
diff --git a/src/msw/taskbar.cpp b/src/msw/taskbar.cpp
index f6512bba8b..57ce4633f8 100644
--- a/src/msw/taskbar.cpp
+++ b/src/msw/taskbar.cpp
@@ -91,7 +91,7 @@ public:
     {
         if (msg == gs_msgRestartTaskbar || msg == gs_msgTaskbar)
         {
-            return m_icon->WindowProc(GetHWND(), msg, wParam, lParam);
+            return m_icon->WindowProc(msg, wParam, lParam);
         }
         else
         {
@@ -268,9 +268,8 @@ void wxTaskBarIcon::RegisterWindowMessages()
 // wxTaskBarIcon window proc
 // ----------------------------------------------------------------------------
 
-long wxTaskBarIcon::WindowProc(WXHWND hWnd,
-                               unsigned int msg,
-                               unsigned int wParam,
+long wxTaskBarIcon::WindowProc(unsigned int msg,
+                               unsigned int WXUNUSED(wParam),
                                long lParam)
 {
     wxEventType eventType = 0;