diff --git a/src/msw/ole/activex.cpp b/src/msw/ole/activex.cpp
index a707456c3f..74abdc50cf 100644
--- a/src/msw/ole/activex.cpp
+++ b/src/msw/ole/activex.cpp
@@ -768,7 +768,7 @@ namespace
 const int invalid_entry_marker = 0;
 }
 
-wxVariant wxActiveXEvents::ms_invalidEntryMarker(static_cast<const void*>(&invalid_entry_marker));
+wxVariant wxActiveXEvents::ms_invalidEntryMarker(const_cast<void*>(static_cast<const void*>(&invalid_entry_marker)));
 
 size_t wxActiveXEvent::ParamCount() const
 {