diff --git a/src/msw/ole/access.cpp b/src/msw/ole/access.cpp
index 7a937766bb..56f871eece 100644
--- a/src/msw/ole/access.cpp
+++ b/src/msw/ole/access.cpp
@@ -297,8 +297,8 @@ public:
 
 // Obsolete
 
-    STDMETHODIMP put_accName(VARIANT /* varChild */, BSTR /* szName */) { return E_FAIL; }
-    STDMETHODIMP put_accValue(VARIANT /* varChild */, BSTR /* szName */) { return E_FAIL; }
+    STDMETHODIMP put_accName(VARIANT WXUNUSED(varChild), BSTR WXUNUSED(szName)) { return E_FAIL; }
+    STDMETHODIMP put_accValue(VARIANT WXUNUSED(varChild), BSTR WXUNUSED(szName)) { return E_FAIL; }
 
 // IDispatch