diff --git a/pkgs/tools/X11/x11vnc/default.nix b/pkgs/tools/X11/x11vnc/default.nix
index 118ce5398c3..e9e9e4b4dab 100644
--- a/pkgs/tools/X11/x11vnc/default.nix
+++ b/pkgs/tools/X11/x11vnc/default.nix
@@ -51,10 +51,6 @@ stdenv.mkDerivation rec {
     sed -i -e '/^\tXdummy.c\ \\$/,$d' -e 's/\tx11vnc_loop\ \\/\tx11vnc_loop/' misc/Makefile.am
   '';
 
-  preConfigure = ''
-    configureFlags="--mandir=$out/share/man"
-  '';
-
   meta = with lib; {
     description = "A VNC server connected to a real X11 screen";
     homepage = "https://github.com/LibVNC/x11vnc/";