diff --git a/src/msw/dc.cpp b/src/msw/dc.cpp
index 8c3e241194..58d8960413 100644
--- a/src/msw/dc.cpp
+++ b/src/msw/dc.cpp
@@ -2747,7 +2747,7 @@ static bool AlphaBlt(wxMSWDCImpl* dcDst,
                      int srcX, int srcY,
                      int srcWidth, int srcHeight,
                      HDC hdcSrc,
-                     const wxBitmap& bmpSrc)
+                     const wxBitmap& WXUNUSED_UNLESS_DEBUG(bmpSrc))
 {
     wxASSERT_MSG( bmpSrc.IsOk() && bmpSrc.HasAlpha(),
                     wxT("AlphaBlt(): invalid bitmap") );
diff --git a/src/msw/toolbar.cpp b/src/msw/toolbar.cpp
index b136869a8b..489c2de407 100644
--- a/src/msw/toolbar.cpp
+++ b/src/msw/toolbar.cpp
@@ -1603,7 +1603,8 @@ void wxToolBar::DoEnableTool(wxToolBarToolBase *tool, bool enable)
     DoToggleTool(tool, tool->IsToggled());
 }
 
-void wxToolBar::DoToggleTool(wxToolBarToolBase *tool, bool toggle)
+void wxToolBar::DoToggleTool(wxToolBarToolBase *tool,
+                             bool WXUNUSED_UNLESS_DEBUG(toggle))
 {
     wxASSERT_MSG( tool->IsToggled() == toggle, wxT("Inconsistent tool state") );