diff --git a/pkgs/development/python-modules/btest/default.nix b/pkgs/development/python-modules/btest/default.nix
index 44a510dc8895..61c4c29b765f 100644
--- a/pkgs/development/python-modules/btest/default.nix
+++ b/pkgs/development/python-modules/btest/default.nix
@@ -2,6 +2,7 @@
   lib,
   buildPythonPackage,
   fetchFromGitHub,
+  multiprocess,
   pythonOlder,
   setuptools,
 }:
@@ -22,6 +23,8 @@ buildPythonPackage rec {
 
   build-system = [ setuptools ];
 
+  dependencies = [ multiprocess ];
+
   # No tests available and no module to import
   doCheck = false;