diff --git a/src/msw/treectrl.cpp b/src/msw/treectrl.cpp
index 08f8e0779f..d2370e8184 100644
--- a/src/msw/treectrl.cpp
+++ b/src/msw/treectrl.cpp
@@ -293,9 +293,9 @@ class wxTreeItemParam
 {
 public:
     wxTreeItemParam()
-        : m_item(NULL),
-          m_data(NULL)
     {
+        m_data = NULL;
+
         for ( size_t n = 0; n < WXSIZEOF(m_images); n++ )
         {
             m_images[n] = -1;