diff --git a/web/editor_ui.tsx b/web/editor_ui.tsx
index 24bd1c2e..1e45a12b 100644
--- a/web/editor_ui.tsx
+++ b/web/editor_ui.tsx
@@ -106,7 +106,7 @@ export class MainUI {
         } else if (storedDarkModePreference === false) {
           theme = "light";
         } else {
-          theme = window.matchMedia("(prefers-color-scheme: dark)").matches
+          theme = globalThis.matchMedia("(prefers-color-scheme: dark)").matches
             ? "dark"
             : "light";
         }
diff --git a/web/space_lua/stdlib/os.ts b/web/space_lua/stdlib/os.ts
index 7e5ff001..e17c7a02 100644
--- a/web/space_lua/stdlib/os.ts
+++ b/web/space_lua/stdlib/os.ts
@@ -1,4 +1,3 @@
-import { secureHeapUsed } from "node:crypto";
 import { LuaBuiltinFunction, LuaTable } from "../runtime.ts";
 
 const ONE_DAY = 1000 * 60 * 60 * 24;