diff --git a/pkgs/development/python-modules/pecan/default.nix b/pkgs/development/python-modules/pecan/default.nix
index c6c5b99d980..70d71ea5179 100644
--- a/pkgs/development/python-modules/pecan/default.nix
+++ b/pkgs/development/python-modules/pecan/default.nix
@@ -12,6 +12,7 @@
 , gunicorn
 , jinja2
 , virtualenv
+, mock
 }:
 
 buildPythonPackage rec {
@@ -28,6 +29,8 @@ buildPythonPackage rec {
     webtest Mako genshi Kajiki sqlalchemy gunicorn jinja2 virtualenv
   ];
 
+  checkInputs = [ mock ];
+
   meta = with stdenv.lib; {
     description = "Pecan";
     homepage = "https://github.com/pecan/pecan";