diff --git a/pkgs/desktops/mate/mate-user-guide/default.nix b/pkgs/desktops/mate/mate-user-guide/default.nix
index 89a5e9720e6..c092bb56961 100644
--- a/pkgs/desktops/mate/mate-user-guide/default.nix
+++ b/pkgs/desktops/mate/mate-user-guide/default.nix
@@ -13,6 +13,11 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ yelp ];
 
+  postPatch = ''
+    substituteInPlace mate-user-guide.desktop.in.in \
+      --replace "Exec=yelp" "Exec=${yelp}/bin/yelp"
+  '';
+
   meta = with stdenv.lib; {
     description = "MATE User Guide";
     homepage = "https://mate-desktop.org";