diff --git a/extra/ui/x11/x11.factor b/extra/ui/x11/x11.factor
index 62944500ef..e4794452c7 100755
--- a/extra/ui/x11/x11.factor
+++ b/extra/ui/x11/x11.factor
@@ -1,6 +1,6 @@
 ! Copyright (C) 2005, 2007 Eduardo Cavazos and Slava Pestov
 ! See http://factorcode.org/license.txt for BSD license.
-USING: alien arrays ui ui.gadgets ui.gestures ui.backend
+USING: alien alien.c-types arrays ui ui.gadgets ui.gestures ui.backend
 ui.clipboards ui.gadgets.worlds assocs kernel math namespaces
 opengl sequences strings x11.xlib x11.events x11.xim x11.glx
 x11.clipboard x11.constants x11.windows io.utf8 combinators
@@ -217,6 +217,19 @@ M: x-clipboard paste-clipboard
 M: x11-ui-backend set-title ( string world -- )
     world-handle x11-handle-window swap dpy get -rot
     3dup set-title-old set-title-new ;
+    
+M: x11-ui-backend set-fullscreen* ( ? world -- )
+    world-handle x11-handle-window "XClientMessageEvent" <c-object>
+    tuck set-XClientMessageEvent-window
+    swap _NET_WM_STATE_ADD _NET_WM_STATE_REMOVE ?
+    over set-XClientMessageEvent-data0
+    ClientMessage over set-XClientMessageEvent-type
+    dpy get over set-XClientMessageEvent-display
+    "_NET_WM_STATE" x-atom over set-XClientMessageEvent-message_type
+    32 over set-XClientMessageEvent-format
+    "_NET_WM_STATE_FULLSCREEN" x-atom over set-XClientMessageEvent-data1
+    >r dpy get root get 0 SubstructureNotifyMask r> XSendEvent drop ;
+
 
 M: x11-ui-backend (open-window) ( world -- )
     dup gadget-window
diff --git a/extra/x11/constants/constants.factor b/extra/x11/constants/constants.factor
index 367f40cebd..5781fdc806 100644
--- a/extra/x11/constants/constants.factor
+++ b/extra/x11/constants/constants.factor
@@ -402,3 +402,8 @@ TYPEDEF: uchar KeyCode
 : LSBFirst              0 ;
 : MSBFirst              1 ;
 
+! *****************************************************************
+! * EXTENDED WINDOW MANAGER HINTS
+! *****************************************************************
+
+C-ENUM: _NET_WM_STATE_REMOVE _NET_WM_STATE_ADD _NET_WM_STATE_TOGGLE ;
\ No newline at end of file