diff --git a/pkgs/applications/networking/irc/quassel/default.nix b/pkgs/applications/networking/irc/quassel/default.nix
index 6addd66ac634..d1b950a7757c 100644
--- a/pkgs/applications/networking/irc/quassel/default.nix
+++ b/pkgs/applications/networking/irc/quassel/default.nix
@@ -5,7 +5,7 @@
 , static ? false # link statically
 
 , stdenv, fetchFromGitHub, cmake, makeWrapper, dconf
-, qtbase, qtscript
+, mkDerivation, qtbase, qtscript
 , phonon, libdbusmenu, qca-qt5
 
 , withKDE ? true # enable KDE integration
@@ -20,6 +20,7 @@
 }:
 
 let
+    inherit (stdenv) lib;
     buildClient = monolithic || client;
     buildCore = monolithic || enableDaemon;
 in
@@ -31,7 +32,7 @@ assert !buildClient -> !withKDE; # KDE is used by the client only
 let
   edf = flag: feature: [("-D" + feature + (if flag then "=ON" else "=OFF"))];
 
-in with stdenv; mkDerivation rec {
+in (if !buildClient then stdenv.mkDerivation else mkDerivation) rec {
   name = "quassel${tag}-${version}";
   version = "0.13.1";
 
@@ -67,13 +68,15 @@ in with stdenv; mkDerivation rec {
     ++ edf client "WANT_QTCLIENT"
     ++ edf withKDE "WITH_KDE";
 
-  preFixup =
+  dontWrapQtApps = true;
+
+  postFixup =
     lib.optionalString enableDaemon ''
-        wrapProgram "$out/bin/quasselcore" --suffix PATH : "${qtbase.bin}/bin"
+      wrapProgram "$out/bin/quasselcore" --suffix PATH : "${qtbase.bin}/bin"
     '' +
     lib.optionalString buildClient ''
-        wrapProgram "$out/bin/quassel${lib.optionalString client "client"}" \
-          --prefix GIO_EXTRA_MODULES : "${dconf}/lib/gio/modules"
+      wrapQtApp "$out/bin/quassel${lib.optionalString client "client"}" \
+        --prefix GIO_EXTRA_MODULES : "${dconf}/lib/gio/modules"
     '';
 
   meta = with stdenv.lib; {