diff --git a/src/msw/ole/activex.cpp b/src/msw/ole/activex.cpp
index 7f23874d09..176fc6673f 100644
--- a/src/msw/ole/activex.cpp
+++ b/src/msw/ole/activex.cpp
@@ -691,7 +691,7 @@ private:
 
 public:
     wxActiveXEvents(wxActiveXContainer *ax) : m_activeX(ax), m_haveCustomId(false) {}
-    wxActiveXEvents(wxActiveXContainer *ax, REFIID iid) : m_activeX(ax), m_haveCustomId(true), m_customId(iid) {}
+    wxActiveXEvents(wxActiveXContainer *ax, REFIID iid) : m_activeX(ax), m_customId(iid), m_haveCustomId(true) {}
     virtual ~wxActiveXEvents()
     {
     }