diff --git a/include/wx/dataview.h b/include/wx/dataview.h
index d92a21eee9..08a54eb40d 100644
--- a/include/wx/dataview.h
+++ b/include/wx/dataview.h
@@ -382,7 +382,7 @@ public:
     // implement base methods
     virtual unsigned int GetChildren( const wxDataViewItem &item, wxDataViewItemArray &children ) const wxOVERRIDE;
 
-    unsigned int GetCount() const wxOVERRIDE { return m_hash.GetCount(); }
+    unsigned int GetCount() const wxOVERRIDE { return (unsigned int)m_hash.GetCount(); }
 
 private:
     wxDataViewItemArray m_hash;