diff --git a/pkgs/os-specific/linux/hal/default.nix b/pkgs/os-specific/linux/hal/default.nix
index 2ca2d32ab412..b6fdfac367cc 100644
--- a/pkgs/os-specific/linux/hal/default.nix
+++ b/pkgs/os-specific/linux/hal/default.nix
@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
   '';
 
   propagatedBuildInputs = [ libusb ]
-    ++ stdenv.lib.optional (stdenv.system != "armv5tel-linux") [ libsmbios ];
+    ++ stdenv.lib.optionals (stdenv.system != "armv5tel-linux") [ libsmbios ];
 
   preConfigure = ''
     for i in hald/linux/probing/probe-smbios.c hald/linux/osspec.c \