diff --git a/tslib.es6.js b/tslib.es6.js
index 55dd360..b212c25 100644
--- a/tslib.es6.js
+++ b/tslib.es6.js
@@ -296,7 +296,7 @@ export function __classPrivateFieldIn(state, receiver) {
 export function __addDisposableResource(env, value, async) {
     if (value !== null && value !== void 0) {
         if (typeof value !== "object" && typeof value !== "function") throw new TypeError("Object expected.");
-        var dispose;
+        var dispose, inner;
         if (async) {
             if (!Symbol.asyncDispose) throw new TypeError("Symbol.asyncDispose is not defined.");
             dispose = value[Symbol.asyncDispose];
@@ -304,14 +304,17 @@ export function __addDisposableResource(env, value, async) {
         if (dispose === void 0) {
             if (!Symbol.dispose) throw new TypeError("Symbol.dispose is not defined.");
             dispose = value[Symbol.dispose];
+            if (async) inner = dispose;
         }
         if (typeof dispose !== "function") throw new TypeError("Object not disposable.");
+        if (inner) dispose = function() { try { inner.call(this); } catch (e) { return Promise.reject(e); } };
         env.stack.push({ value: value, dispose: dispose, async: async });
     }
     else if (async) {
         env.stack.push({ async: true });
     }
     return value;
+
 }
 
 var _SuppressedError = typeof SuppressedError === "function" ? SuppressedError : function (error, suppressed, message) {
diff --git a/tslib.es6.mjs b/tslib.es6.mjs
index 65081a6..0df91b1 100644
--- a/tslib.es6.mjs
+++ b/tslib.es6.mjs
@@ -296,16 +296,18 @@ export function __classPrivateFieldIn(state, receiver) {
 export function __addDisposableResource(env, value, async) {
   if (value !== null && value !== void 0) {
     if (typeof value !== "object" && typeof value !== "function") throw new TypeError("Object expected.");
-    var dispose;
+    var dispose, inner;
     if (async) {
-        if (!Symbol.asyncDispose) throw new TypeError("Symbol.asyncDispose is not defined.");
-        dispose = value[Symbol.asyncDispose];
+      if (!Symbol.asyncDispose) throw new TypeError("Symbol.asyncDispose is not defined.");
+      dispose = value[Symbol.asyncDispose];
     }
     if (dispose === void 0) {
-        if (!Symbol.dispose) throw new TypeError("Symbol.dispose is not defined.");
-        dispose = value[Symbol.dispose];
+      if (!Symbol.dispose) throw new TypeError("Symbol.dispose is not defined.");
+      dispose = value[Symbol.dispose];
+      if (async) inner = dispose;
     }
     if (typeof dispose !== "function") throw new TypeError("Object not disposable.");
+    if (inner) dispose = function() { try { inner.call(this); } catch (e) { return Promise.reject(e); } };
     env.stack.push({ value: value, dispose: dispose, async: async });
   }
   else if (async) {
diff --git a/tslib.js b/tslib.js
index 697469f..0f7c846 100644
--- a/tslib.js
+++ b/tslib.js
@@ -344,7 +344,7 @@ var __disposeResources;
     __addDisposableResource = function (env, value, async) {
         if (value !== null && value !== void 0) {
             if (typeof value !== "object" && typeof value !== "function") throw new TypeError("Object expected.");
-            var dispose;
+            var dispose, inner;
             if (async) {
                 if (!Symbol.asyncDispose) throw new TypeError("Symbol.asyncDispose is not defined.");
                 dispose = value[Symbol.asyncDispose];
@@ -352,8 +352,10 @@ var __disposeResources;
             if (dispose === void 0) {
                 if (!Symbol.dispose) throw new TypeError("Symbol.dispose is not defined.");
                 dispose = value[Symbol.dispose];
+                if (async) inner = dispose;
             }
             if (typeof dispose !== "function") throw new TypeError("Object not disposable.");
+            if (inner) dispose = function() { try { inner.call(this); } catch (e) { return Promise.reject(e); } };
             env.stack.push({ value: value, dispose: dispose, async: async });
         }
         else if (async) {