diff --git a/common/rfb/CMsgWriter.h b/common/rfb/CMsgWriter.h
index 06ecbe7..f9de72f 100644
--- a/common/rfb/CMsgWriter.h
+++ b/common/rfb/CMsgWriter.h
@@ -33,7 +33,7 @@
 
   class PixelFormat;
   class ConnParams;
-  class ScreenSet;
+  struct ScreenSet;
   struct Rect;
 
   class CMsgWriter : public InputHandler {