diff --git a/overlays/nixpak/firefox.nix b/overlays/nixpak/firefox.nix
index da31a53..74591e6 100644
--- a/overlays/nixpak/firefox.nix
+++ b/overlays/nixpak/firefox.nix
@@ -77,6 +77,7 @@
 
     wrappedFirefox = prev.wrapFirefox (sandboxed-firefox-esr.config.env // {
       meta = prev.firefox-esr.meta;
+      gtk3 = prev.firefox-esr.gtk3;
     }) {
       applicationName = "firefox-esr";
       pname = "firefox-esr";