diff --git a/include/wx/generic/listctrl.h b/include/wx/generic/listctrl.h
index 6efe3d70ac..dbc93a9a85 100644
--- a/include/wx/generic/listctrl.h
+++ b/include/wx/generic/listctrl.h
@@ -101,7 +101,7 @@ public:
     bool SetItemImage( long item, int image, int selImage);
     wxString GetItemText( long item ) const;
     void SetItemText( long item, const wxString& str );
-    long GetItemData( long item ) const;
+    wxUIntPtr GetItemData( long item ) const;
     bool SetItemData( long item, long data );
     bool GetItemRect( long item, wxRect& rect, int code = wxLIST_RECT_BOUNDS ) const;
     bool GetItemPosition( long item, wxPoint& pos ) const;
@@ -141,7 +141,7 @@ public:
 
     bool EnsureVisible( long item );
     long FindItem( long start, const wxString& str, bool partial = false );
-    long FindItem( long start, long data );
+    long FindItem( long start, wxUIntPtr data );
     long FindItem( long start, const wxPoint& pt, int direction ); // not supported in wxGLC
     long HitTest( const wxPoint& point, int& flags);
     long InsertItem(wxListItem& info);
diff --git a/include/wx/msw/listctrl.h b/include/wx/msw/listctrl.h
index 6ba1bea220..2c5ca5e04b 100644
--- a/include/wx/msw/listctrl.h
+++ b/include/wx/msw/listctrl.h
@@ -169,7 +169,7 @@ public:
     void SetItemText(long item, const wxString& str) ;
 
     // Gets the item data
-    long GetItemData(long item) const ;
+    wxUIntPtr GetItemData(long item) const ;
 
     // Sets the item data
     bool SetItemData(long item, long data) ;
@@ -284,7 +284,7 @@ public:
 
     // Find an item whose data matches this data, starting from the item after 'start'
     // or the beginning if 'start' is -1.
-    long FindItem(long start, long data);
+    long FindItem(long start, wxUIntPtr data);
 
     // Find an item nearest this position in the specified direction, starting from
     // the item after 'start' or the beginning if 'start' is -1.
diff --git a/src/generic/listctrl.cpp b/src/generic/listctrl.cpp
index 3a2774b15e..573f8c91f6 100644
--- a/src/generic/listctrl.cpp
+++ b/src/generic/listctrl.cpp
@@ -164,7 +164,7 @@ public:
 
     void SetItem( const wxListItem &info );
     void SetImage( int image ) { m_image = image; }
-    void SetData( long data ) { m_data = data; }
+    void SetData( wxUIntPtr data ) { m_data = data; }
     void SetPosition( int x, int y );
     void SetSize( int width, int height );
 
@@ -203,7 +203,7 @@ public:
     int m_image;
 
     // user data associated with the item
-    long m_data;
+    wxUIntPtr m_data;
 
     // the item coordinates are not used in report mode, instead this pointer
     // is NULL and the owner window is used to retrieve the item position and
@@ -679,7 +679,7 @@ public:
     void DeleteEverything();
     void EnsureVisible( long index );
     long FindItem( long start, const wxString& str, bool partial = false );
-    long FindItem( long start, long data);
+    long FindItem( long start, wxUIntPtr data);
     long FindItem( const wxPoint& pt );
     long HitTest( int x, int y, int &flags );
     void InsertItem( wxListItem &item );
@@ -4271,7 +4271,7 @@ long wxListMainWindow::FindItem(long start, const wxString& str, bool WXUNUSED(p
     return wxNOT_FOUND;
 }
 
-long wxListMainWindow::FindItem(long start, long data)
+long wxListMainWindow::FindItem(long start, wxUIntPtr data)
 {
     long pos = start;
     if (pos < 0)
@@ -4466,9 +4466,9 @@ int LINKAGEMODE list_ctrl_compare_func_1( wxListLineData **arg1, wxListLineData
     wxListLineData *line2 = *arg2;
     wxListItem item;
     line1->GetItem( 0, item );
-    long data1 = item.m_data;
+    wxUIntPtr data1 = item.m_data;
     line2->GetItem( 0, item );
-    long data2 = item.m_data;
+    wxUIntPtr data2 = item.m_data;
     return list_ctrl_compare_func_2( data1, data2, list_ctrl_compare_data );
 }
 
@@ -4840,7 +4840,7 @@ void wxGenericListCtrl::SetItemText( long item, const wxString& str )
     m_mainWin->SetItemText(item, str);
 }
 
-long wxGenericListCtrl::GetItemData( long item ) const
+wxUIntPtr wxGenericListCtrl::GetItemData( long item ) const
 {
     wxListItem info;
     info.m_itemId = item;
@@ -5080,7 +5080,7 @@ long wxGenericListCtrl::FindItem( long start, const wxString& str,  bool partial
     return m_mainWin->FindItem( start, str, partial );
 }
 
-long wxGenericListCtrl::FindItem( long start, long data )
+long wxGenericListCtrl::FindItem( long start, wxUIntPtr data )
 {
     return m_mainWin->FindItem( start, data );
 }
diff --git a/src/msw/listctrl.cpp b/src/msw/listctrl.cpp
index 9d2fc92173..03215598d1 100644
--- a/src/msw/listctrl.cpp
+++ b/src/msw/listctrl.cpp
@@ -938,7 +938,7 @@ void wxListCtrl::SetItemText(long item, const wxString& str)
 }
 
 // Gets the item data
-long wxListCtrl::GetItemData(long item) const
+wxUIntPtr wxListCtrl::GetItemData(long item) const
 {
     wxListItem info;
 
@@ -1375,7 +1375,7 @@ long wxListCtrl::FindItem(long start, const wxString& str, bool partial)
 // NOTE : Lindsay Mathieson - 14-July-2002
 //        No longer use ListView_FindItem as the data attribute is now stored
 //        in a wxListItemInternalData structure refernced by the actual lParam
-long wxListCtrl::FindItem(long start, long data)
+long wxListCtrl::FindItem(long start, wxUIntPtr data)
 {
     long  idx = start + 1;
     long count = GetItemCount();