diff --git a/pkgs/tools/filesystems/nixpart/0.4/default.nix b/pkgs/tools/filesystems/nixpart/0.4/default.nix
index 758e130e4adf..6a1c12e3e722 100644
--- a/pkgs/tools/filesystems/nixpart/0.4/default.nix
+++ b/pkgs/tools/filesystems/nixpart/0.4/default.nix
@@ -1,6 +1,8 @@
 { stdenv, fetchurl, python, buildPythonApplication
 # Propagated to blivet
 , useNixUdev ? true
+# Needed by NixOps
+, udevSoMajor ? null
 # Propagated dependencies
 , pkgs, urlgrabber
 }: