diff --git a/unix/xserver15.patch b/unix/xserver15.patch
index 2c2831e..ee7f4fe 100644
--- a/unix/xserver15.patch
+++ b/unix/xserver15.patch
@@ -22,7 +22,7 @@
  fi
  
 +dnl Xvnc DDX
-+AC_SUBST([XVNC_CPPFLAGS], ["-DHAVE_DIX_CONFIG_H $XEXT_INC $FB_INC $MI_INC $RENDER_INC"])
++AC_SUBST([XVNC_CPPFLAGS], ["-DHAVE_DIX_CONFIG_H $XEXT_INC $FB_INC $MI_INC $RENDER_INC $RANDR_INC"])
 +AC_SUBST([XVNC_LIBS], ["$FB_LIB $FIXES_LIB $XEXT_LIB $CONFIG_LIB $DBE_LIB $XTRAP_LIB $RECORD_LIB $GLX_LIBS $RENDER_LIB $RANDR_LIB $DAMAGE_LIB $MIEXT_DAMAGE_LIB $MIEXT_SHADOW_LIB $XI_LIB $XKB_LIB $XKB_STUB_LIB $COMPOSITE_LIB $XPSTUBS_LIB"])
  
  dnl Xnest DDX