diff --git a/pkgs/development/python-modules/lxml/default.nix b/pkgs/development/python-modules/lxml/default.nix
index 816b3a676828..fca4366e8a0e 100644
--- a/pkgs/development/python-modules/lxml/default.nix
+++ b/pkgs/development/python-modules/lxml/default.nix
@@ -15,7 +15,7 @@ buildPythonPackage rec {
   };
 
   nativeBuildInputs = [ libxml2.dev libxslt.dev ];
-  buildInputs = [ libxml2 libxslt ];
+  propagatedBuildInputs = [ libxml2 libxslt ];
 
   hardeningDisable = stdenv.lib.optional stdenv.isDarwin "format";
 
diff --git a/pkgs/development/python-modules/ncclient/default.nix b/pkgs/development/python-modules/ncclient/default.nix
index 10baadcab302..02e2a1b472a7 100644
--- a/pkgs/development/python-modules/ncclient/default.nix
+++ b/pkgs/development/python-modules/ncclient/default.nix
@@ -4,8 +4,6 @@
 , paramiko
 , selectors2
 , lxml
-, libxml2
-, libxslt
 , nose
 , rednose
 }:
@@ -22,7 +20,7 @@ buildPythonPackage rec {
   checkInputs = [ nose rednose ];
 
   propagatedBuildInputs = [
-    paramiko lxml libxml2 libxslt selectors2
+    paramiko lxml selectors2
   ];
 
   checkPhase = ''