diff --git a/pkgs/development/python-modules/pytest-services/default.nix b/pkgs/development/python-modules/pytest-services/default.nix
index 507cb4467bc..c940dcadc7e 100644
--- a/pkgs/development/python-modules/pytest-services/default.nix
+++ b/pkgs/development/python-modules/pytest-services/default.nix
@@ -6,6 +6,7 @@
 , psutil
 , pytest
 , subprocess32
+, zc_lockfile
 }:
 
 buildPythonPackage rec {
@@ -21,6 +22,7 @@ buildPythonPackage rec {
     requests
     psutil
     pytest
+    zc_lockfile
   ] ++ lib.optional (!isPy3k) subprocess32;
 
   # no tests in PyPI tarball