diff --git a/iso/common.nix b/iso/common.nix
index 7d84b4b..4e64ad4 100644
--- a/iso/common.nix
+++ b/iso/common.nix
@@ -5,6 +5,11 @@ let
 
   pythonEnv = pkgs.python3.withPackages (ps: [ ps.pygobject3 ]);
 
+  installerPy = pkgs.writeShellScriptBin "sovran-install" ''
+    export GI_TYPELIB_PATH=${pkgs.gtk4}/lib/girepository-1.0:${pkgs.libadwaita}/lib/girepository-1.0:${pkgs.glib}/lib/girepository-1.0:${pkgs.pango}/lib/girepository-1.0:${pkgs.gdk-pixbuf}/lib/girepository-1.0:${pkgs.graphene}/lib/girepository-1.0:${pkgs.cairo}/lib/girepository-1.0:${pkgs.harfbuzz}/lib/girepository-1.0
+    export LD_LIBRARY_PATH=${pkgs.gtk4}/lib:${pkgs.libadwaita}/lib:${pkgs.glib}/lib:${pkgs.pango}/lib:${pkgs.gdk-pixbuf}/lib:${pkgs.graphene}/lib:${pkgs.cairo}/lib:${pkgs.harfbuzz}/lib
+    exec ${pythonEnv}/bin/python3 /etc/sovran/installer.py
+  '';
 in
 {
   imports = [
@@ -32,10 +37,17 @@ in
   nix-bitcoin.generateSecrets = true;
 
   environment.systemPackages = with pkgs; [
+    installerPy
     pythonEnv
-    libadwaita
     gtk4
+    libadwaita
     gobject-introspection
+    glib
+    pango
+    gdk-pixbuf
+    graphene
+    cairo
+    harfbuzz
     util-linux
     disko
     parted
@@ -47,12 +59,6 @@ in
     curl
   ];
 
-  # libadwaita and gtk4 typelibs into the session
-  environment.sessionVariables = {
-    GI_TYPELIB_PATH = "${pkgs.libadwaita}/lib/girepository-1.0:${pkgs.gtk4}/lib/girepository-1.0:${pkgs.glib}/lib/girepository-1.0:${pkgs.pango}/lib/girepository-1.0:${pkgs.gdk-pixbuf}/lib/girepository-1.0:${pkgs.graphene}/lib/girepository-1.0";
-    LD_LIBRARY_PATH = "${pkgs.libadwaita}/lib:${pkgs.gtk4}/lib:${pkgs.glib}/lib:${pkgs.pango}/lib:${pkgs.gdk-pixbuf}/lib:${pkgs.graphene}/lib";
-  };
-
   environment.etc."sovran/logo.png".source = ./assets/splash-logo.png;
   environment.etc."sovran/flake".source = sovranSource;
   environment.etc."sovran/installer.py".source = ./installer.py;
@@ -61,7 +67,7 @@ in
 [Desktop Entry]
 Type=Application
 Name=Sovran Guided Installer
-Exec=${pythonEnv}/bin/python3 /etc/sovran/installer.py
+Exec=${installerPy}/bin/sovran-install
 Terminal=false
 X-GNOME-Autostart-enabled=true
 '';