diff --git a/pkgs/applications/networking/mailreaders/mailnag/default.nix b/pkgs/applications/networking/mailreaders/mailnag/default.nix
index 281bc690bad5..e04a5dd469b6 100644
--- a/pkgs/applications/networking/mailreaders/mailnag/default.nix
+++ b/pkgs/applications/networking/mailreaders/mailnag/default.nix
@@ -6,7 +6,9 @@
 , withNetworkManager ? true
 }:
 
-pythonPackages.buildPythonApplication rec {
+let
+  inherit (pythonPackages) python;
+in pythonPackages.buildPythonApplication rec {
   name = "mailnag-${version}";
   version = "1.2.1";
 
@@ -31,6 +33,10 @@ pythonPackages.buildPythonApplication rec {
     pygobject3 dbus-python pyxdg
   ];
 
+  buildPhase = "";
+
+  installPhase = "${python}/bin/python setup.py install --prefix=$out";
+
   doCheck = false;
 
   meta = with stdenv.lib; {