1 files changed, 2 insertions, 1 deletions
diff --git a/FL/x.H b/FL/x.H
index 4e53adaa3..46d276952 100644
--- a/FL/x.H
+++ b/FL/x.H
@@ -25,6 +25,7 @@
 #  define Fl_X_H
 
 #  include "Enumerations.H"
+#  include <FL/Fl_Device.H>
 
 #  ifdef WIN32
 #    include "win32.H"
@@ -132,7 +133,7 @@ extern FL_EXPORT XFontStruct* fl_X_core_font();
 // this object contains all X-specific stuff about a window:
 // Warning: this object is highly subject to change!  
 // FL_LIBRARY or FL_INTERNALS must be defined to access this class.
-class FL_EXPORT Fl_X {
+class FL_EXPORT Fl_X : public Fl_Device {
 public:
   Window xid;
   Window other_xid;