diff --git a/src/msw/caret.cpp b/src/msw/caret.cpp
index 5ed485132e..87e46935a5 100644
--- a/src/msw/caret.cpp
+++ b/src/msw/caret.cpp
@@ -154,7 +154,7 @@ void wxCaret::DoMove()
     if ( m_hasCaret )
     {
         wxWindow *winFocus = wxWindow::FindFocus();
-        wxASSERT_MSG( winFocus == GetWindow(), "how did we lose focus?" );
+        wxASSERT_MSG( winFocus == GetWindow(), _T("how did we lose focus?") );
 
         CALL_CARET_API(SetCaretPos, (m_x, m_y));
     }
diff --git a/src/msw/checkbox.cpp b/src/msw/checkbox.cpp
index e8d646892c..bb95665069 100644
--- a/src/msw/checkbox.cpp
+++ b/src/msw/checkbox.cpp
@@ -272,5 +272,5 @@ bool wxBitmapCheckBox::Create(wxWindow *parent, wxWindowID id, const wxBitmap *l
 
 void wxBitmapCheckBox::SetLabel(const wxBitmap& bitmap)
 {
-    wxFAIL_MSG("not implemented");
+    wxFAIL_MSG(_T("not implemented"));
 }