diff --git a/fltk/extensions.patch b/fltk/extensions.patch
index aa5898c..6eebe84 100644
--- a/fltk/extensions.patch
+++ b/fltk/extensions.patch
@@ -1723,7 +1723,7 @@
          GROUP_RELATIVE  = 1<<16,  ///< position this widget relative to the parent group, not to the window
          COPIED_TOOLTIP  = 1<<17,  ///< the widget tooltip is internally copied, its destruction is handled by the widget
          SIMPLE_KEYBOARD = 1<<18,  ///< the widget wants simple, consistent keypresses and not advanced input (like character composition and CJK input)
-+        FULLSCREEN      = 1<<18,  ///< a fullscreen window (Fl_Window)
++        FULLSCREEN      = 1<<19,  ///< a fullscreen window (Fl_Window)
          // (space for more flags)
          USERFLAG3       = 1<<29,  ///< reserved for 3rd party extensions
          USERFLAG2       = 1<<30,  ///< reserved for 3rd party extensions