diff --git a/res/modules/internal/gui_util.lua b/res/modules/internal/gui_util.lua
index 6d24a93a9..3309e94a0 100644
--- a/res/modules/internal/gui_util.lua
+++ b/res/modules/internal/gui_util.lua
@@ -34,7 +34,7 @@ function gui_util.load_page(query)
     local filename = file.find(string.format("layouts/pages/%s.xml", name))
     if filename then
         name = file.prefix(filename)..":pages/"..name
-        gui.load_document(filename, name, args)
+        gui.load_document(filename, name, args, { app = __vc_app })
         return name
     end
 end
diff --git a/src/logic/scripting/lua/libs/libgui.cpp b/src/logic/scripting/lua/libs/libgui.cpp
index 4d1506e23..cb98de7d7 100644
--- a/src/logic/scripting/lua/libs/libgui.cpp
+++ b/src/logic/scripting/lua/libs/libgui.cpp
@@ -1111,6 +1111,16 @@ static int l_gui_load_document(lua::State* L) {
     );
     auto document = documentPtr.get();
     engine->getAssets()->store(std::move(documentPtr), alias);
+
+    // namespace extension
+    if (lua::istable(L, 4)) {
+        if (lua::get_from(L, "table", "merge")) {
+            lua::pushenv(L, *document->getEnvironment());
+            lua::pushvalue(L, 4);
+            lua::call(L, 2, 0);
+            lua::pop(L);
+        }
+    }
     scripting::on_ui_open(document, {args});
     return 0;
 }