diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 76b379f86a0..e77f22d8b33 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -6159,8 +6159,8 @@ in {
 
   pytest-watch = callPackage ../development/python-modules/pytest-watch { };
 
-  pytest-xdist = self.pytest_xdist; # added 2021-01-04
-  pytest_xdist = callPackage ../development/python-modules/pytest-xdist { };
+  pytest_xdist = self.pytest-xdist; # added 2021-01-04
+  pytest-xdist = callPackage ../development/python-modules/pytest-xdist { };
 
   pytest-xprocess = callPackage ../development/python-modules/pytest-xprocess { };
 
diff --git a/pkgs/top-level/python2-packages.nix b/pkgs/top-level/python2-packages.nix
index c72d5263af9..7fedf700d11 100644
--- a/pkgs/top-level/python2-packages.nix
+++ b/pkgs/top-level/python2-packages.nix
@@ -456,14 +456,15 @@ with self; with super; {
 
   pytestrunner = callPackage ../development/python-modules/pytestrunner/2.nix { };
 
+  pytest_xdist = self.pytest-xdist; # added 2021-01-04
+  pytest-xdist = callPackage ../development/python-modules/pytest-xdist/1.nix { };
+
   python-otr = callPackage ../development/python-modules/python-otr { };
 
   python_statsd = callPackage ../development/python-modules/python_statsd { };
 
   python-sybase = callPackage ../development/python-modules/sybase { };
 
-  python_xdist = callPackage ../development/python-modules/pytest-xdist/1.nix { };
-
   python2-pythondialog = callPackage ../development/python-modules/python2-pythondialog { };
 
   pythonIRClib = callPackage ../development/python-modules/pythonirclib { };