diff --git a/packages/nixpak/modules/gui-base.nix b/packages/nixpak/modules/gui-base.nix
index 480c099..b97fdb7 100644
--- a/packages/nixpak/modules/gui-base.nix
+++ b/packages/nixpak/modules/gui-base.nix
@@ -1,5 +1,9 @@
 { config, lib, pkgs, sloth, ... }:
 
+let
+  envSuffix = envKey: suffix: sloth.concat' (sloth.env envKey) suffix;
+in
+
 {
   config = {
     dbus.policies = {
@@ -18,19 +22,21 @@
     bubblewrap = {
       network = lib.mkDefault false;
       bind.rw = [
-        (sloth.concat' sloth.xdgCacheHome "fontconfig")
-        (sloth.concat' sloth.xdgCacheHome "mesa_shader_cache")
+        (sloth.concat' sloth.xdgCacheHome "/fontconfig")
+        (sloth.concat' sloth.xdgCacheHome "/mesa_shader_cache")
+
         (sloth.concat [
           (sloth.env "XDG_RUNTIME_DIR")
           "/"
           (sloth.env "WAYLAND_DISPLAY")
         ])
-        (sloth.concat' (sloth.env "XDG_RUNTIME_DIR") "/at-spi/bus")
-        (sloth.concat' (sloth.env "XDG_RUNTIME_DIR") "/gvfsd")
-        (sloth.concat' (sloth.env "XDG_RUNTIME_DIR") "/pulse")
+
+        (envSuffix "XDG_RUNTIME_DIR" "/at-spi/bus")
+        (envSuffix "XDG_RUNTIME_DIR" "/gvfsd")
+        (envSuffix "XDG_RUNTIME_DIR" "/pulse")
       ];
       bind.ro = [
-        (sloth.concat' (sloth.env "XDG_RUNTIME_DIR") "/doc")
+        (envSuffix "XDG_RUNTIME_DIR" "/doc")
         (sloth.concat' sloth.xdgConfigHome "/gtk-2.0")
         (sloth.concat' sloth.xdgConfigHome "/gtk-3.0")
         (sloth.concat' sloth.xdgConfigHome "/gtk-4.0")