--- hatari/src/gui-sdl/sdlgui.c	2019/04/01 07:12:48	1.1.1.3
+++ hatari/src/gui-sdl/sdlgui.c	2019/04/01 07:13:17	1.1.1.4
@@ -6,7 +6,7 @@
 
   A tiny graphical user interface for Hatari.
 */
-char SDLGui_rcsid[] = "Hatari $Id: sdlgui.c,v 1.1.1.3 2019/04/01 07:12:48 root Exp $";
+const char SDLGui_rcsid[] = "Hatari $Id: sdlgui.c,v 1.1.1.4 2019/04/01 07:13:17 root Exp $";
 
 #include <SDL.h>
 #include <ctype.h>
@@ -31,10 +31,11 @@ static int fontwidth, fontheight;
 /*
   Load an 1 plane XBM into a 8 planes SDL_Surface.
 */
-static SDL_Surface *SDLGui_LoadXBM(int w, int h, void *pXbmBits)
+static SDL_Surface *SDLGui_LoadXBM(int w, int h, const Uint8 *pXbmBits)
 {
   SDL_Surface *bitmap;
-  Uint8 *dstbits, *srcbits;
+  Uint8 *dstbits;
+  const Uint8 *srcbits;
   int x, y, srcpitch;
   int mask;