diff --git a/src/extension-support/extension-manager.js b/src/extension-support/extension-manager.js
index 9a8f066e..11970ccc 100644
--- a/src/extension-support/extension-manager.js
+++ b/src/extension-support/extension-manager.js
@@ -71,7 +71,7 @@ const createExtensionService = extensionManager => {
 };
 
 class ExtensionManager {
-    constructor (runtime) {
+    constructor (vm) {
         /**
          * The ID number to provide to the next extension worker.
          * @type {int}
@@ -110,12 +110,17 @@ class ExtensionManager {
          */
         this.securityManager = new SecurityManager();
 
+        /**
+         * @type {VirtualMachine}
+         */
+        this.vm = vm;
+
         /**
          * Keep a reference to the runtime so we can construct internal extension objects.
          * TODO: remove this in favor of extensions accessing the runtime as a service.
          * @type {Runtime}
          */
-        this.runtime = runtime;
+        this.runtime = vm.runtime;
 
         this.loadingAsyncExtensions = 0;
         this.asyncExtensionsLoadedCallbacks = [];
@@ -201,7 +206,7 @@ class ExtensionManager {
 
         if (sandboxMode === 'unsandboxed') {
             const {load} = require('./tw-unsandboxed-extension-runner');
-            const extensionObjects = await load(extensionURL);
+            const extensionObjects = await load(extensionURL, this.vm);
             const fakeWorkerId = this.nextExtensionWorker++;
             this.workerURLs[fakeWorkerId] = extensionURL;
 
diff --git a/src/extension-support/tw-unsandboxed-extension-runner.js b/src/extension-support/tw-unsandboxed-extension-runner.js
index e82efe32..96d540ad 100644
--- a/src/extension-support/tw-unsandboxed-extension-runner.js
+++ b/src/extension-support/tw-unsandboxed-extension-runner.js
@@ -3,8 +3,10 @@ const BlockType = require('../extension-support/block-type');
 const TargetType = require('../extension-support/target-type');
 const AsyncLimiter = require('../util/async-limiter');
 
-const loadUnsandboxedExtension = extensionURL => new Promise((resolve, reject) => {
+const loadUnsandboxedExtension = (extensionURL, vm) => new Promise((resolve, reject) => {
     global.Scratch = global.Scratch || {};
+    global.Scratch.vm = vm;
+    global.Scratch.renderer = vm.runtime.renderer;
     global.Scratch.ArgumentType = ArgumentType;
     global.Scratch.BlockType = BlockType;
     global.Scratch.TargetType = TargetType;
@@ -31,7 +33,7 @@ const loadUnsandboxedExtension = extensionURL => new Promise((resolve, reject) =
 // Because loading unsandboxed extensions requires messing with global state (global.Scratch),
 // only let one extension load at a time.
 const limiter = new AsyncLimiter(loadUnsandboxedExtension, 1);
-const load = extensionURL => limiter.do(extensionURL);
+const load = (extensionURL, vm) => limiter.do(extensionURL, vm);
 
 module.exports = {
     load
diff --git a/src/virtual-machine.js b/src/virtual-machine.js
index b7e2cdd7..f2a95411 100644
--- a/src/virtual-machine.js
+++ b/src/virtual-machine.js
@@ -196,7 +196,7 @@ class VirtualMachine extends EventEmitter {
             this.emit(Runtime.TURBO_MODE_ON);
         });
 
-        this.extensionManager = new ExtensionManager(this.runtime);
+        this.extensionManager = new ExtensionManager(this);
         this.securityManager = this.extensionManager.securityManager;
         this.runtime.extensionManager = this.extensionManager;