diff --git a/pkgs/desktops/xfce/core/thunar/default.nix b/pkgs/desktops/xfce/core/thunar/default.nix
index 2a6878fbf76d..c64a69603186 100644
--- a/pkgs/desktops/xfce/core/thunar/default.nix
+++ b/pkgs/desktops/xfce/core/thunar/default.nix
@@ -21,9 +21,9 @@
 let unwrapped = mkXfceDerivation {
   category = "xfce";
   pname = "thunar";
-  version = "4.18.0";
+  version = "4.18.1";
 
-  sha256 = "sha256-vsc5vEdyYEtpKktBiIRayZl7MjHrxKzL7iwzvBCAqG0=";
+  sha256 = "sha256-n624TZGygFrOjkQ9fUVJUetRV8JDXYSg89tOHm4Va+M=";
 
   nativeBuildInputs = [
     docbook_xsl
@@ -46,8 +46,6 @@ let unwrapped = mkXfceDerivation {
 
   configureFlags = [ "--with-custom-thunarx-dirs-enabled" ];
 
-  NIX_CFLAGS_COMPILE = "-I${libxfce4ui.dev}/include/xfce4";
-
   # the desktop file … is in an insecure location»
   # which pops up when invoking desktop files that are
   # symlinks to the /nix/store