diff --git a/pkgs/development/libraries/libusb1/default.nix b/pkgs/development/libraries/libusb1/default.nix
index a3323c8e026b..b425440d1463 100644
--- a/pkgs/development/libraries/libusb1/default.nix
+++ b/pkgs/development/libraries/libusb1/default.nix
@@ -3,14 +3,12 @@
 , autoreconfHook
 , pkgconfig
 , enableSystemd ? stdenv.isLinux && !stdenv.hostPlatform.isMusl
-, systemd ? null
+, systemd
 , libobjc
 , IOKit
 , withStatic ? false
 }:
 
-assert enableSystemd -> systemd != null;
-
 stdenv.mkDerivation rec {
   pname = "libusb";
   version = "1.0.23";