diff --git a/include/wx/buffer.h b/include/wx/buffer.h
index e8de10a3c7..4cc340aa51 100644
--- a/include/wx/buffer.h
+++ b/include/wx/buffer.h
@@ -182,7 +182,7 @@ private:
     struct Data : public wxPrivate::UntypedBufferData
     {
         Data(CharType *str, Kind kind = Owned)
-            : UntypedBufferData(str, kind)
+            : wxPrivate::UntypedBufferData(str, kind)
         {
         }