diff --git a/hw/straylight/default.nix b/hw/straylight/default.nix
index 20e23a1..b54de72 100644
--- a/hw/straylight/default.nix
+++ b/hw/straylight/default.nix
@@ -394,6 +394,42 @@ in
       };
     };
 
+    # Hermes Desktop (`hermes desktop`) builds and launches an unpackaged
+    # Electron binary from ~/.hermes/hermes-agent/apps/desktop. It runs through
+    # nix-ld, so the Electron/Chromium runtime libraries have to be listed here.
+    programs.nix-ld.libraries = with pkgs; [
+      glib
+      nspr
+      nss
+      dbus
+      at-spi2-atk
+      at-spi2-core
+      cups
+      cairo
+      gtk3
+      pango
+      gdk-pixbuf
+      libx11
+      libxcomposite
+      libxdamage
+      libxext
+      libxfixes
+      libxrandr
+      libxcb
+      libxkbcommon
+      libgbm
+      libdrm
+      libglvnd
+      mesa
+      vulkan-loader
+      expat
+      systemd # libudev
+      alsa-lib
+      libpulseaudio
+      libnotify
+      libsecret
+    ];
+
     # Headless Chromium exposing a CDP endpoint for Hermes browser tools.
     # Loopback only; browser.cdp_url in ~/.hermes/config.yaml points at it.
     # Ungoogled-chromium (already in desktop-packages-light.nix), no ad-block