diff --git a/vncviewer/DesktopWindow.h b/vncviewer/DesktopWindow.h
index 2a4613c..6008d06 100644
--- a/vncviewer/DesktopWindow.h
+++ b/vncviewer/DesktopWindow.h
@@ -88,6 +88,8 @@
 
   static void handleGrab(void *data);
 
+  void maximizeWindow();
+
   static void handleResizeTimeout(void *data);
   void remoteResize();