diff --git a/src/lib/python/pyodide.ts b/src/lib/python/pyodide.ts
index 76a9a9e..afd10ae 100644
--- a/src/lib/python/pyodide.ts
+++ b/src/lib/python/pyodide.ts
@@ -44,13 +44,17 @@ export async function asyncRunScenario(
 export async function runScenario(scenario: string) {
     const pythonProgram = `
     import pyodide_http
+    import pyodide_js
+    import os
     pyodide_http.patch_all()
     print(globals())
     from js import scenario_json
-    import demoland_engine
     import json
     import time
 
+    os.environ["DEMOLAND"] = pyodide_js.globals.get("DEMOLAND")
+    import demoland_engine
+
     start = time.time()
     scenario = json.loads(scenario_json)
 
diff --git a/src/lib/python/pyodide_worker.ts b/src/lib/python/pyodide_worker.ts
index bae328f..c364960 100644
--- a/src/lib/python/pyodide_worker.ts
+++ b/src/lib/python/pyodide_worker.ts
@@ -42,7 +42,8 @@ self.onmessage = async (event) => {
     // package itself. We need to set this as a global variable here, which lets
     // us do `import pyodide_js; pyodide_js.globals.get("BASE_URL")` (in the
     // `cache.py` file).
-    // self.pyodide.globals.set("BASE_URL", BASE_URL);
+    let secondLastPart = window.location.pathname.split("/").slice(-2, -1)[0];
+    self.pyodide.globals.set("DEMOLAND", secondLastPart);
 
     try {
         await self.pyodide.loadPackagesFromImports(python);