diff --git a/lib/loader/index.d.ts b/lib/loader/index.d.ts
index ce2dc2ef3a..40977b5a19 100644
--- a/lib/loader/index.d.ts
+++ b/lib/loader/index.d.ts
@@ -85,20 +85,20 @@ export interface ASUtil {
   /** Tests whether a managed object is an instance of the class represented by the specified base id. */
   __instanceof(ptr: number, baseId: number): boolean;
   /** Allocates a new string in the module's memory and returns a reference (pointer) to it. */
-  __newString(str: string): number;
+  __newString(str: string): Promise<number>;
   /** Allocates a new ArrayBuffer in the module's memory and returns a reference (pointer) to it. */
-  __newArrayBuffer(buf: ArrayBuffer): number;
+  __newArrayBuffer(buf: ArrayBuffer): Promise<number>;
   /** Allocates a new array in the module's memory and returns a reference (pointer) to it. */
-  __newArray(id: number, values: ArrayLike<number>): number;
+  __newArray(id: number, values: ArrayLike<number>): Promise<number>;
 
   /** Allocates an instance of the class represented by the specified id. */
-  __new(size: number, id: number): number;
+  __new(size: number, id: number): Promise<number>;
   /** Pins a managed object externally, preventing it from becoming garbage collected. */
-  __pin(ptr: number): number;
+  __pin(ptr: number): Promise<number>;
   /** Unpins a managed object externally, allowing it to become garbage collected. */
-  __unpin(ptr: number): void;
+  __unpin(ptr: number): Promise<void>;
   /** Performs a full garbage collection cycle. */
-  __collect(incremental?: boolean): void;
+  __collect(incremental?: boolean): Promise<void>;
 }
 
 /** Asynchronously instantiates an AssemblyScript module from anything that can be instantiated. */
diff --git a/lib/loader/index.js b/lib/loader/index.js
index f0bfca90fa..d015390466 100644
--- a/lib/loader/index.js
+++ b/lib/loader/index.js
@@ -1,3 +1,5 @@
+import { instantiate as asyncInstantiate } from 'asyncify-wasm';
+
 // Runtime header offsets
 const ID_OFFSET = -8;
 const SIZE_OFFSET = -4;
@@ -139,10 +141,10 @@ function postInstantiate(extendedExports, instance) {
   // }
 
   /** Allocates a new string in the module's memory and returns its pointer. */
-  function __newString(str) {
+  async function __newString(str) {
     if (str == null) return 0;
     const length = str.length;
-    const ptr = __new(length << 1, STRING_ID);
+    const ptr = await __new(length << 1, STRING_ID);
     const U16 = new Uint16Array(memory.buffer);
     for (var i = 0, p = ptr >>> 1; i < length; ++i) U16[p + i] = str.charCodeAt(i);
     return ptr;
@@ -193,18 +195,18 @@ function postInstantiate(extendedExports, instance) {
   }
 
   /** Allocates a new array in the module's memory and returns its pointer. */
-  function __newArray(id, values) {
+  async function __newArray(id, values) {
     const info = getArrayInfo(id);
     const align = getValueAlign(info);
     const length = values.length;
-    const buf = __new(length << align, info & STATICARRAY ? id : ARRAYBUFFER_ID);
+    const buf = await __new(length << align, info & STATICARRAY ? id : ARRAYBUFFER_ID);
     let result;
     if (info & STATICARRAY) {
       result = buf;
     } else {
-      __pin(buf);
-      const arr = __new(info & ARRAY ? ARRAY_SIZE : ARRAYBUFFERVIEW_SIZE, id);
-      __unpin(buf);
+      await __pin(buf);
+      const arr = await __new(info & ARRAY ? ARRAY_SIZE : ARRAYBUFFERVIEW_SIZE, id);
+      await __unpin(buf);
       const U32 = new Uint32Array(memory.buffer);
       U32[arr + ARRAYBUFFERVIEW_BUFFER_OFFSET >>> 2] = buf;
       U32[arr + ARRAYBUFFERVIEW_DATASTART_OFFSET >>> 2] = buf;
@@ -338,7 +340,7 @@ export async function instantiate(source, imports = {}) {
   if (isResponse(source = await source)) return instantiateStreaming(source, imports);
   const module = isModule(source) ? source : await WebAssembly.compile(source);
   const extended = preInstantiate(imports);
-  const instance = await WebAssembly.instantiate(module, imports);
+  const instance = await asyncInstantiate(module, imports);
   const exports = postInstantiate(extended, instance);
   return { module, instance, exports };
 }
@@ -395,6 +397,9 @@ export function demangle(exports, extendedExports = {}) {
         ctor.prototype = {
           valueOf() { return this[THIS]; }
         };
+        ctor.__new = async function(...args) {
+          return ctor.wrap(await ctor.prototype.constructor(0, ...args));
+        };
         ctor.wrap = function(thisValue) {
           return Object.create(ctor.prototype, { [THIS]: { value: thisValue, writable: false } });
         };
diff --git a/lib/loader/package.json b/lib/loader/package.json
index 2092906ae5..f6d8dc4834 100644
--- a/lib/loader/package.json
+++ b/lib/loader/package.json
@@ -46,5 +46,8 @@
   ],
   "devDependencies": {
     "esm2umd": "^0.1.2"
+  },
+  "dependencies": {
+    "asyncify-wasm": "^1.2.1"
   }
 }
diff --git a/lib/loader/umd/index.js b/lib/loader/umd/index.js
index 44a6fe11a0..134cc953d8 100644
--- a/lib/loader/umd/index.js
+++ b/lib/loader/umd/index.js
@@ -10,6 +10,9 @@ var loader = (function(exports) {
   exports.instantiateStreaming = instantiateStreaming;
   exports.demangle = demangle;
   exports.default = void 0;
+  
+  var _asyncifyWasm = require("asyncify-wasm");
+  
   // Runtime header offsets
   const ID_OFFSET = -8;
   const SIZE_OFFSET = -4; // Runtime ids
@@ -171,12 +174,10 @@ var loader = (function(exports) {
     /** Allocates a new string in the module's memory and returns its pointer. */
   
   
-    function __newString(str) {
+    async function __newString(str) {
       if (str == null) return 0;
       const length = str.length;
-  
-      const ptr = __new(length << 1, STRING_ID);
-  
+      const ptr = await __new(length << 1, STRING_ID);
       const U16 = new Uint16Array(memory.buffer);
   
       for (var i = 0, p = ptr >>> 1; i < length; ++i) U16[p + i] = str.charCodeAt(i);
@@ -230,24 +231,19 @@ var loader = (function(exports) {
     /** Allocates a new array in the module's memory and returns its pointer. */
   
   
-    function __newArray(id, values) {
+    async function __newArray(id, values) {
       const info = getArrayInfo(id);
       const align = getValueAlign(info);
       const length = values.length;
-  
-      const buf = __new(length << align, info & STATICARRAY ? id : ARRAYBUFFER_ID);
-  
+      const buf = await __new(length << align, info & STATICARRAY ? id : ARRAYBUFFER_ID);
       let result;
   
       if (info & STATICARRAY) {
         result = buf;
       } else {
-        __pin(buf);
-  
-        const arr = __new(info & ARRAY ? ARRAY_SIZE : ARRAYBUFFERVIEW_SIZE, id);
-  
-        __unpin(buf);
-  
+        await __pin(buf);
+        const arr = await __new(info & ARRAY ? ARRAY_SIZE : ARRAYBUFFERVIEW_SIZE, id);
+        await __unpin(buf);
         const U32 = new Uint32Array(memory.buffer);
         U32[arr + ARRAYBUFFERVIEW_BUFFER_OFFSET >>> 2] = buf;
         U32[arr + ARRAYBUFFERVIEW_DATASTART_OFFSET >>> 2] = buf;
@@ -377,7 +373,7 @@ var loader = (function(exports) {
     if (isResponse(source = await source)) return instantiateStreaming(source, imports);
     const module = isModule(source) ? source : await WebAssembly.compile(source);
     const extended = preInstantiate(imports);
-    const instance = await WebAssembly.instantiate(module, imports);
+    const instance = await (0, _asyncifyWasm.instantiate)(module, imports);
     const exports = postInstantiate(extended, instance);
     return {
       module,
@@ -455,6 +451,10 @@ var loader = (function(exports) {
   
           };
   
+          ctor.__new = async function (...args) {
+            return ctor.wrap(await ctor.prototype.constructor(0, ...args));
+          };
+  
           ctor.wrap = function (thisValue) {
             return Object.create(ctor.prototype, {
               [THIS]: {