diff --git a/pkgs/by-name/ne/networkmanager-strongswan/package.nix b/pkgs/by-name/ne/networkmanager-strongswan/package.nix
index 1f0b5327f07b..71f80f142314 100644
--- a/pkgs/by-name/ne/networkmanager-strongswan/package.nix
+++ b/pkgs/by-name/ne/networkmanager-strongswan/package.nix
@@ -45,7 +45,7 @@ stdenv.mkDerivation rec {
     "--with-gtk4"
   ];
 
-  PKG_CONFIG_LIBNM_VPNSERVICEDIR = "${placeholder "out"}/lib/NetworkManager/VPN";
+  env.PKG_CONFIG_LIBNM_VPNSERVICEDIR = "${placeholder "out"}/lib/NetworkManager/VPN";
 
   passthru = {
     networkManagerPlugin = "VPN/nm-strongswan-service.name";