diff --git a/vncviewer/parameters.h b/vncviewer/parameters.h
index e4378c8..682b6d6 100644
--- a/vncviewer/parameters.h
+++ b/vncviewer/parameters.h
@@ -51,6 +51,7 @@
 extern rfb::BoolParameter shared;
 
 extern rfb::BoolParameter acceptClipboard;
+extern rfb::BoolParameter setPrimary;
 extern rfb::BoolParameter sendClipboard;
 #if !defined(WIN32) && !defined(__APPLE__)
 extern rfb::BoolParameter sendPrimary;