diff --git a/src/video/x11/SDL_x11sym.h b/src/video/x11/SDL_x11sym.h
index 7f3bbbc76..013409fc0 100644
--- a/src/video/x11/SDL_x11sym.h
+++ b/src/video/x11/SDL_x11sym.h
@@ -159,9 +159,11 @@ SDL_X11_SYM(Bool,XShmQueryExtension,(Display* a),(a),return)
  * Not required...these only exist in code in headers on some 64-bit platforms,
  *  and are removed via macros elsewhere, so it's safe for them to be missing.
  */
+#ifdef LONG64
 SDL_X11_MODULE(IO_32BIT)
 SDL_X11_SYM(int,_XData32,(Display *dpy,register long *data,unsigned len),(dpy,data,len),return)
 SDL_X11_SYM(void,_XRead32,(Display *dpy,register long *data,long len),(dpy,data,len),)
+#endif
 
 /*
  * These only show up on some variants of Unix.