diff --git a/vncviewer/DesktopWindow.cxx b/vncviewer/DesktopWindow.cxx
index 6fc2b92..ca33ebe 100644
--- a/vncviewer/DesktopWindow.cxx
+++ b/vncviewer/DesktopWindow.cxx
@@ -439,7 +439,13 @@
 #elif defined(__APPLE__)
   int ret;
   
-  ret = cocoa_capture_display(this);
+  ret = cocoa_capture_display(this,
+#ifdef HAVE_FLTK_FULLSCREEN_SCREENS
+                              fullScreenAllMonitors
+#else
+                              false
+#endif
+                              );
   if (ret != 0)
     vlog.error(_("Failure grabbing keyboard"));
 #else