diff --git a/uisimulator/alpha.h b/uisimulator/alpha.h
deleted file mode 100644
index 4ff99037b3..0000000000
--- a/uisimulator/alpha.h
+++ /dev/null
@@ -1,22 +0,0 @@
-/* xscreensaver, Copyright (c) 1992, 1995, 1996, 1997
- *  Jamie Zawinski <jwz@jwz.org>
- *
- * Permission to use, copy, modify, distribute, and sell this software and its
- * documentation for any purpose is hereby granted without fee, provided that
- * the above copyright notice appear in all copies and that both that
- * copyright notice and this permission notice appear in supporting
- * documentation.  No representations are made about the suitability of this
- * software for any purpose.  It is provided "as is" without express or 
- * implied warranty.
- */
-
-#ifndef __XSCREENSAVER_ALPHA_H__
-#define __XSCREENSAVER_ALPHA_H__
-
-extern Bool allocate_alpha_colors (Screen *screen, Visual *visual,
-                                   Colormap cmap,
-                                   int *nplanesP, Bool additive_p,
-                                   unsigned long **plane_masks,
-                                   unsigned long *base_pixelP);
-
-#endif /* __XSCREENSAVER_ALPHA_H__ */
diff --git a/uisimulator/uibasic.c b/uisimulator/uibasic.c
index 74b09f7e9a..2d9f33fb7d 100644
--- a/uisimulator/uibasic.c
+++ b/uisimulator/uibasic.c
@@ -30,7 +30,6 @@
 #include <time.h>
 
 #include "screenhack.h"
-#include "alpha.h"
 
 #include "version.h"