diff --git a/unix/vncviewer/CConn.cxx b/unix/vncviewer/CConn.cxx
index 79195a8..47ccbb2 100644
--- a/unix/vncviewer/CConn.cxx
+++ b/unix/vncviewer/CConn.cxx
@@ -273,8 +273,9 @@
 }
 
 // setExtendedDesktopSize() is a more advanced version of setDesktopSize()
-void CConn::setExtendedDesktopSize(int reason, int result, int w, int h) {
-  CConnection::setExtendedDesktopSize(reason, result, w,h);
+void CConn::setExtendedDesktopSize(int reason, int result, int w, int h,
+                                   const rfb::ScreenSet& layout) {
+  CConnection::setExtendedDesktopSize(reason, result, w, h, layout);
 
   if ((reason == reasonClient) && (result != resultSuccess))
     return;
diff --git a/unix/vncviewer/CConn.h b/unix/vncviewer/CConn.h
index 27ab8e3..10a12e4 100644
--- a/unix/vncviewer/CConn.h
+++ b/unix/vncviewer/CConn.h
@@ -75,7 +75,8 @@
   rfb::CSecurity* getCSecurity(int secType);
   void serverInit();
   void setDesktopSize(int w, int h);
-  void setExtendedDesktopSize(int reason, int result, int w, int h);
+  void setExtendedDesktopSize(int reason, int result, int w, int h,
+                              const rfb::ScreenSet& layout);
   void setName(const char* name);
   void setColourMapEntries(int firstColour, int nColours, rdr::U16* rgbs);
   void bell();