diff --git a/pkgs/development/python-modules/glymur/default.nix b/pkgs/development/python-modules/glymur/default.nix
index f14245865f59..40748f86954e 100644
--- a/pkgs/development/python-modules/glymur/default.nix
+++ b/pkgs/development/python-modules/glymur/default.nix
@@ -10,6 +10,7 @@
 , mock
 , importlib-resources
 , isPy27
+, lxml
 }:
 
 buildPythonPackage rec {
@@ -31,6 +32,7 @@ buildPythonPackage rec {
     scikitimage
     procps
     pytestCheckHook
+    lxml
   ];
 
   postConfigure = ''