diff --git a/pkgs/development/python-modules/pathlib2/default.nix b/pkgs/development/python-modules/pathlib2/default.nix
index bbaff2731020..86d3ed871661 100644
--- a/pkgs/development/python-modules/pathlib2/default.nix
+++ b/pkgs/development/python-modules/pathlib2/default.nix
@@ -5,7 +5,8 @@
 , pythonOlder
 , scandir ? null
 , glibcLocales
-, mock ? null
+, mock
+, typing
 }:
 
 buildPythonPackage rec {
@@ -17,8 +18,10 @@ buildPythonPackage rec {
     sha256 = "sha256-n+DtrYmLg8DD4ZnIQrJ+0hZkXS4Xd1ey3Wc4TUETxkE=";
   };
 
-  propagatedBuildInputs = [ six ] ++ lib.optional (pythonOlder "3.5") scandir;
-  checkInputs = [ glibcLocales ] ++ lib.optional (pythonOlder "3.3") mock;
+  propagatedBuildInputs = [ six ]
+    ++ lib.optionals (pythonOlder "3.5") [ scandir typing ];
+  checkInputs = [ glibcLocales ]
+    ++ lib.optional (pythonOlder "3.3") mock;
 
   preCheck = ''
     export LC_ALL="en_US.UTF-8"