diff --git a/pkgs/development/python-modules/pytest-xdist/default.nix b/pkgs/development/python-modules/pytest-xdist/default.nix
index fa1b0f63fabc..1bdf899ec0c1 100644
--- a/pkgs/development/python-modules/pytest-xdist/default.nix
+++ b/pkgs/development/python-modules/pytest-xdist/default.nix
@@ -9,6 +9,7 @@
 , pytest
 , pytest-forked
 , psutil
+, pexpect
 }:
 
 buildPythonPackage rec {
@@ -25,7 +26,7 @@ buildPythonPackage rec {
   buildInputs = [
     pytest
   ];
-  checkInputs = [ pytestCheckHook filelock ];
+  checkInputs = [ pytestCheckHook filelock pexpect ];
   propagatedBuildInputs = [ execnet pytest-forked psutil ];
 
   # access file system