diff --git a/pkgs/applications/misc/ocropus/default.nix b/pkgs/applications/misc/ocropus/default.nix
index 66c0b883c72..fef3209d11a 100644
--- a/pkgs/applications/misc/ocropus/default.nix
+++ b/pkgs/applications/misc/ocropus/default.nix
@@ -47,7 +47,7 @@ pythonPackages.buildPythonPackage rec {
   patches = [ ./display.patch ];
 
   propagatedBuildInputs = with pythonPackages; [ curl numpy scipy pillow
-    matplotlib beautifulsoup4 pygtk ];
+    matplotlib beautifulsoup4 pygtk lxml ];
 
   enableParallelBuilding = true;