diff --git a/mastus/fts_xapian.nix b/mastus/fts_xapian.nix
new file mode 100644
index 0000000..8a0f2d4
--- /dev/null
+++ b/mastus/fts_xapian.nix
@@ -0,0 +1,35 @@
+{ stdenv, fetchFromGitHub, autoconf, automake, pkg-config, dovecot, libtool, xapian, icu64, sqlite }:
+stdenv.mkDerivation {
+  pname = "fts-xapian";
+  version = "1.3.1";
+
+  src = fetchFromGitHub {
+    owner = "grosjo";
+    repo = "fts-xapian";
+    rev = "1.3.1";
+    sha256 = "10yl5fyfbx2ijqckx13vbmzj9mpm5pkh8qzichbdgplrzm738q43";
+  };
+
+  buildInputs = [ dovecot xapian icu64 sqlite ];
+
+  nativeBuildInputs = [ autoconf automake libtool pkg-config ];
+
+  preConfigure = ''
+    export PANDOC=false
+    autoreconf -vi
+  '';
+
+  configureFlags = [
+    "--with-dovecot=${dovecot}/lib/dovecot"
+    "--without-dovecot-install-dirs"
+    "--with-moduledir=$(out)/lib/dovecot"
+  ];
+
+  meta = with stdenv.lib; {
+    homepage = "https://github.com/grosjo/fts-xapian";
+    description = "Dovecot FTS plugin based on Xapian";
+    license = licenses.lgpl21;
+    maintainers = with maintainers; [ julm ];
+    platforms = platforms.unix;
+  };
+}
diff --git a/mastus/mail.nix b/mastus/mail.nix
index aa87845..b471a75 100644
--- a/mastus/mail.nix
+++ b/mastus/mail.nix
@@ -76,6 +76,7 @@
         }
       }
     '';
+    modules = [ (pkgs.callPackage ./fts_xapian.nix {}) ];
   };
   systemd.services.dovecotSslKey = rec {
     wantedBy = [ "dovecot2.service" ];