diff --git a/pkgs/servers/x11/xorg/default.nix b/pkgs/servers/x11/xorg/default.nix
index c64a0fd86b51..c1e0ab6a8f67 100644
--- a/pkgs/servers/x11/xorg/default.nix
+++ b/pkgs/servers/x11/xorg/default.nix
@@ -2108,11 +2108,11 @@ let
   }) // {inherit ;};
 
   xorgserver = (mkDerivation "xorgserver" {
-    name = "xorg-server-1.17.2";
+    name = "xorg-server-1.18.0";
     builder = ./builder.sh;
     src = fetchurl {
-      url = mirror://xorg/individual/xserver/xorg-server-1.17.2.tar.bz2;
-      sha256 = "14vr4mm0x94a9bd3sfx9mdh8qhvk48zcml3i8q1wbwi84xhj04gn";
+      url = mirror://xorg/individual/xserver/xorg-server-1.18.0.tar.bz2;
+      sha256 = "0biimwnp17wz80nplybpi940y3dyd7hgp5fyipfwxncmjs0p0mhr";
     };
     buildInputs = [pkgconfig dri2proto dri3proto renderproto libdrm openssl libX11 libXau libXaw libxcb xcbutil xcbutilwm xcbutilimage xcbutilkeysyms xcbutilrenderutil libXdmcp libXfixes libxkbfile libXmu libXpm libXrender libXres libXt ];
   }) // {inherit dri2proto dri3proto renderproto libdrm openssl libX11 libXau libXaw libxcb xcbutil xcbutilwm xcbutilimage xcbutilkeysyms xcbutilrenderutil libXdmcp libXfixes libxkbfile libXmu libXpm libXrender libXres libXt ;};
diff --git a/pkgs/servers/x11/xorg/fix_segfault.patch b/pkgs/servers/x11/xorg/fix_segfault.patch
deleted file mode 100644
index b3a7d2ed5e00..000000000000
--- a/pkgs/servers/x11/xorg/fix_segfault.patch
+++ /dev/null
@@ -1,63 +0,0 @@
-From 7cc7ffd25d5e50b54cb942d07d4cb160f20ff9c5 Mon Sep 17 00:00:00 2001
-From: Martin Peres <martin.peres@linux.intel.com>
-Date: Fri, 17 Jul 2015 17:21:26 +0300
-Subject: [PATCH] os: make sure the clientsWritable fd_set is initialized
- before use
-
-In WaitForSomething(), the fd_set clientsWritable may be used unitialized when
-the boolean AnyClientsWriteBlocked is set in the WakeupHandler(). This leads to
-a crash in FlushAllOutput() after x11proto's commit
-2c94cdb453bc641246cc8b9a876da9799bee1ce7.
-
-The problem did not manifest before because both the XFD_SIZE and the maximum
-number of clients were set to 256. As the connectionTranslation table was
-initalized for the 256 clients to 0, the test on the index not being 0 was
-aborting before dereferencing the client #0.
-
-As of commit 2c94cdb453bc641246cc8b9a876da9799bee1ce7 in x11proto, the XFD_SIZE
-got bumped to 512. This lead the OutputPending fd_set to have any fd above 256
-to be uninitialized which in turns lead to reading an index after the end of
-the ConnectionTranslation table. This index would then be used to find the
-client corresponding to the fd marked as pending writes and would also result
-to an out-of-bound access which would usually be the fatal one.
-
-Fix this by zeroing the clientsWritable fd_set at the beginning of
-WaitForSomething(). In this case, the bottom part of the loop, which would
-indirectly call FlushAllOutput, will not do any work but the next call to
-select will result in the execution of the right codepath. This is exactly what
-we want because we need to know the writable clients before handling them. In
-the end, it also makes sure that the fds above MaxClient are initialized,
-preventing the crash in FlushAllOutput().
-
-Thanks to everyone involved in tracking this one down!
-
-Reported-by: Karol Herbst <freedesktop@karolherbst.de>
-Reported-by: Tobias Klausmann <tobias.klausmann@mni.thm.de>
-Signed-off-by: Martin Peres <martin.peres@linux.intel.com>
-Tested-by: Martin Peres <martin.peres@linux.intel.com>
-Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91316
-Cc: Ilia Mirkin  <imirkin@alum.mit.edu>
-Cc: Martin Peres <martin.peres@linux.intel.com>
-Cc: Olivier Fourdan <ofourdan@redhat.com
-Cc: Adam Jackson <ajax@redhat.com>
-Cc: Alan Coopersmith <alan.coopersmith@oracle.com
-Cc: Chris Wilson <chris@chris-wilson.co.uk>
----
- os/WaitFor.c | 1 +
- 1 file changed, 1 insertion(+)
-
-diff --git a/os/WaitFor.c b/os/WaitFor.c
-index 431f1a6..993c14e 100644
---- a/os/WaitFor.c
-+++ b/os/WaitFor.c
-@@ -158,6 +158,7 @@ WaitForSomething(int *pClientsReady)
-     Bool someReady = FALSE;
- 
-     FD_ZERO(&clientsReadable);
-+    FD_ZERO(&clientsWritable);
- 
-     if (nready)
-         SmartScheduleStopTimer();
--- 
-2.4.5
-
diff --git a/pkgs/servers/x11/xorg/overrides.nix b/pkgs/servers/x11/xorg/overrides.nix
index 1339e51eb232..78be046366db 100644
--- a/pkgs/servers/x11/xorg/overrides.nix
+++ b/pkgs/servers/x11/xorg/overrides.nix
@@ -291,7 +291,7 @@ in
         dri2proto dri3proto kbproto xineramaproto resourceproto scrnsaverproto videoproto
       ];
       # fix_segfault: https://bugs.freedesktop.org/show_bug.cgi?id=91316
-      commonPatches = [ ./xorgserver-xkbcomp-path.patch ./fix_segfault.patch ];
+      commonPatches = [ ./xorgserver-xkbcomp-path.patch ];
       # XQuartz requires two compilations: the first to get X / XQuartz,
       # and the second to get Xvfb, Xnest, etc.
       darwinOtherX = overrideDerivation xorgserver (oldAttrs: {