diff --git a/overlays/nixpak/firefox.nix b/overlays/nixpak/firefox.nix
index cef16fc..82bb58d 100644
--- a/overlays/nixpak/firefox.nix
+++ b/overlays/nixpak/firefox.nix
@@ -64,7 +64,7 @@
             "/sys/bus/pci"
             "/etc/resolv.conf"
             "/etc/localtime"
-            ["${prev.firefox-esr}/lib/firefox" "/app/etc/firefox"]
+            ["${intermediary-firefox-esr}/lib/firefox" "/app/etc/firefox"]
             (sloth.concat' sloth.xdgConfigHome "/dconf")
             (sloth.concat' sloth.xdgConfigHome "/gtk-2.0")
             (sloth.concat' sloth.xdgConfigHome "/gtk-3.0")