diff --git a/common/kbutton.h b/common/kbutton.h
index 504e2345..04c4615a 100644
--- a/common/kbutton.h
+++ b/common/kbutton.h
@@ -1,18 +1,35 @@
-//========= Copyright © 1996-2002, Valve LLC, All rights reserved. ============
-//
-// Purpose:
-//
-// $NoKeywords: $
-//=============================================================================
+/*
+Copyright (C) 1996-1997 Id Software, Inc.
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+See the GNU General Public License for more details.
 
-#if !defined( KBUTTONH )
-#define KBUTTONH
-#pragma once
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
-typedef struct kbutton_s
+*/
+#ifndef KBUTTON_H
+#define KBUTTON_H
+
+// a1ba: copied from WinQuake/client.h
+//
+// cl_input
+//
+typedef struct
 {
 	int		down[2];		// key nums holding it down
 	int		state;			// low bit is down state
 } kbutton_t;
 
-#endif // !KBUTTONH
+STATIC_ASSERT( sizeof( kbutton_t ) == 12, "kbutton_t isn't 12 bytes!" );
+
+#endif // KBUTTON_H