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-rw-r--r--pkgs/tools/networking/dhcpcd/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/tools/networking/dhcpcd/default.nix b/pkgs/tools/networking/dhcpcd/default.nix
index cc1bad106f753..0962335ad1a3d 100644
--- a/pkgs/tools/networking/dhcpcd/default.nix
+++ b/pkgs/tools/networking/dhcpcd/default.nix
@@ -44,7 +44,7 @@ stdenv.mkDerivation rec {
   installFlags = [ "DBDIR=$(TMPDIR)/db" "SYSCONFDIR=${placeholder "out"}/etc" ];
 
   # Check that the udev plugin got built.
-  postInstall = lib.optional (udev != null) "[ -e ${placeholder "out"}/lib/dhcpcd/dev/udev.so ]";
+  postInstall = lib.optionalString (udev != null) "[ -e ${placeholder "out"}/lib/dhcpcd/dev/udev.so ]";
 
   meta = with lib; {
     description = "A client for the Dynamic Host Configuration Protocol (DHCP)";