diff --git a/common/rfb/SMsgWriter.h b/common/rfb/SMsgWriter.h
index 548b8e8..6c665b6 100644
--- a/common/rfb/SMsgWriter.h
+++ b/common/rfb/SMsgWriter.h
@@ -32,7 +32,7 @@
 namespace rfb {
 
   class ConnParams;
-  class ScreenSet;
+  struct ScreenSet;
 
   class SMsgWriter {
   public: