diff --git a/include/wx/rawbmp.h b/include/wx/rawbmp.h
index e2998760e1..2172b870db 100644
--- a/include/wx/rawbmp.h
+++ b/include/wx/rawbmp.h
@@ -468,7 +468,7 @@ struct WXDLLEXPORT wxPixelDataOut<wxBitmap>
         // the type of the class we're working with
         typedef wxBitmap ImageType;
 
-        class Iterator
+        class WXDLLEXPORT Iterator
         {
         public:
             // the pixel format we use