diff --git a/pkgs/development/python-modules/pyudev/default.nix b/pkgs/development/python-modules/pyudev/default.nix
index c0a401a1b2a..aabf9cd5de5 100644
--- a/pkgs/development/python-modules/pyudev/default.nix
+++ b/pkgs/development/python-modules/pyudev/default.nix
@@ -13,7 +13,7 @@ buildPythonPackage rec {
 
   postPatch = ''
     substituteInPlace src/pyudev/_ctypeslib/utils.py \
-      --replace "find_library(name)" "'${systemd.lib}/lib/libudev.so'"
+      --replace "find_library(name)" "'${lib.getLib systemd}/lib/libudev.so'"
     '';
 
   checkInputs = [ pytest mock hypothesis docutils ];