diff --git a/nixos/modules/services/hardware/fwupd.nix b/nixos/modules/services/hardware/fwupd.nix
index 1f4acd21ecc..d8abde2a600 100644
--- a/nixos/modules/services/hardware/fwupd.nix
+++ b/nixos/modules/services/hardware/fwupd.nix
@@ -8,12 +8,8 @@ let
   cfg = config.services.fwupd;
   originalEtc =
     let
-      isRegular = v: v == "regular";
-      listFiles = d: builtins.attrNames (filterAttrs (const isRegular) (builtins.readDir d));
-      copiedDirs = [ "fwupd/remotes.d" "pki/fwupd" "pki/fwupd-metadata" ];
-      originalFiles = concatMap (d: map (f: "${d}/${f}") (listFiles "${pkgs.fwupd}/etc/${d}")) copiedDirs;
       mkEtcFile = n: nameValuePair n { source = "${pkgs.fwupd}/etc/${n}"; };
-    in listToAttrs (map mkEtcFile originalFiles);
+    in listToAttrs (map mkEtcFile pkgs.fwupd.filesInstalledToEtc);
   extraTrustedKeys =
     let
       mkName = p: "pki/fwupd/${baseNameOf (toString p)}";
diff --git a/pkgs/os-specific/linux/firmware/fwupd/default.nix b/pkgs/os-specific/linux/firmware/fwupd/default.nix
index ab25ed79514..aad4f5f61df 100644
--- a/pkgs/os-specific/linux/firmware/fwupd/default.nix
+++ b/pkgs/os-specific/linux/firmware/fwupd/default.nix
@@ -6,6 +6,7 @@
 , shared_mime_info, umockdev
 }:
 let
+  # Updating? Keep $out/etc synchronized with passthru.filesInstalledToEtc
   version = "1.0.5";
   python = python3.withPackages (p: with p; [ pygobject3 pycairo pillow ]);
   installedTestsPython = python3.withPackages (p: with p; [ pygobject3 requests ]);
@@ -66,6 +67,20 @@ in stdenv.mkDerivation {
       --prefix GI_TYPELIB_PATH : "$out/lib/girepository-1.0:${libsoup}/lib/girepository-1.0"
   '';
 
+  passthru = {
+    filesInstalledToEtc = [
+      "fwupd/remotes.d/fwupd.conf"
+      "fwupd/remotes.d/lvfs-testing.conf"
+      "fwupd/remotes.d/lvfs.conf"
+      "fwupd/remotes.d/vendor.conf"
+      "pki/fwupd/GPG-KEY-Hughski-Limited"
+      "pki/fwupd/GPG-KEY-Linux-Vendor-Firmware-Service"
+      "pki/fwupd/LVFS-CA.pem"
+      "pki/fwupd-metadata/GPG-KEY-Linux-Vendor-Firmware-Service"
+      "pki/fwupd-metadata/LVFS-CA.pem"
+    ];
+  };
+
   meta = with stdenv.lib; {
     homepage = https://fwupd.org/;
     maintainers = with maintainers; [];