diff --git a/packages/zone.js/lib/common/promise.ts b/packages/zone.js/lib/common/promise.ts
index cc5f401e90..1faae6effc 100644
--- a/packages/zone.js/lib/common/promise.ts
+++ b/packages/zone.js/lib/common/promise.ts
@@ -176,25 +176,20 @@ Zone.__load_patch('ZoneAwarePromise', (global: any, Zone: ZoneType, api: _ZonePr
         }
         if (queue.length == 0 && state == REJECTED) {
           (promise as any)[symbolState] = REJECTED_NO_CATCH;
-          let uncaughtPromiseError: any;
-          if (value instanceof Error || (value && value.message)) {
-            uncaughtPromiseError = value;
-          } else {
-            try {
-              // try to print more readable error log
-              throw new Error(
-                  'Uncaught (in promise): ' + readableObjectToString(value) +
-                  (value && value.stack ? '\n' + value.stack : ''));
-            } catch (err) {
-              uncaughtPromiseError = err;
-            }
+          try {
+            // try to print more readable error log
+            throw new Error(
+                'Uncaught (in promise): ' + readableObjectToString(value) +
+                (value && value.stack ? '\n' + value.stack : ''));
+          } catch (err) {
+            const error: UncaughtPromiseError = err;
+            error.rejection = value;
+            error.promise = promise;
+            error.zone = Zone.current;
+            error.task = Zone.currentTask !;
+            _uncaughtPromiseErrors.push(error);
+            api.scheduleMicroTask();  // to make sure that it is running
           }
-          uncaughtPromiseError.rejection = value;
-          uncaughtPromiseError.promise = promise;
-          uncaughtPromiseError.zone = Zone.current;
-          uncaughtPromiseError.task = Zone.currentTask !;
-          _uncaughtPromiseErrors.push(uncaughtPromiseError);
-          api.scheduleMicroTask();  // to make sure that it is running
         }
       }
     }
diff --git a/packages/zone.js/test/common/Promise.spec.ts b/packages/zone.js/test/common/Promise.spec.ts
index 6f0f3e2da4..7165b184be 100644
--- a/packages/zone.js/test/common/Promise.spec.ts
+++ b/packages/zone.js/test/common/Promise.spec.ts
@@ -345,8 +345,11 @@ describe(
                 });
             setTimeout((): any => null);
             setTimeout(() => {
+              expect(promiseError !.message)
+                  .toBe(
+                      'Uncaught (in promise): ' + error +
+                      (error !.stack ? '\n' + error !.stack : ''));
               expect((promiseError as any)['rejection']).toBe(error);
-              expect(promiseError).toBe(error);
               expect((promiseError as any)['zone']).toBe(zone);
               expect((promiseError as any)['task']).toBe(task);
               done();
@@ -386,39 +389,6 @@ describe(
           });
         });
 
-        it('should print original information when throw a not error object with a message property',
-           (done) => {
-             let promiseError: Error|null = null;
-             let zone: Zone|null = null;
-             let task: Task|null = null;
-             let rejectObj: TestRejection;
-             queueZone
-                 .fork({
-                   name: 'promise-error',
-                   onHandleError: (delegate: ZoneDelegate, current: Zone, target: Zone, error: any):
-                                      boolean => {
-                                        promiseError = error;
-                                        delegate.handleError(target, error);
-                                        return false;
-                                      }
-                 })
-                 .run(() => {
-                   zone = Zone.current;
-                   task = Zone.currentTask;
-                   rejectObj = new TestRejection();
-                   rejectObj.prop1 = 'value1';
-                   rejectObj.prop2 = 'value2';
-                   (rejectObj as any).message = 'rejectMessage';
-                   Promise.reject(rejectObj);
-                   expect(promiseError).toBe(null);
-                 });
-             setTimeout((): any => null);
-             setTimeout(() => {
-               expect(promiseError).toEqual(rejectObj as any);
-               done();
-             });
-           });
-
         describe('Promise.race', () => {
           it('should reject the value', () => {
             queueZone.run(() => {
diff --git a/packages/zone.js/test/zone-spec/fake-async-test.spec.ts b/packages/zone.js/test/zone-spec/fake-async-test.spec.ts
index ce642bd4dd..f538f6af88 100644
--- a/packages/zone.js/test/zone-spec/fake-async-test.spec.ts
+++ b/packages/zone.js/test/zone-spec/fake-async-test.spec.ts
@@ -84,7 +84,9 @@ describe('FakeAsyncTestZoneSpec', () => {
        () => {
          fakeAsyncTestZone.run(() => {
            Promise.resolve(null).then((_) => { throw new Error('async'); });
-           expect(() => { testZoneSpec.flushMicrotasks(); }).toThrowError(/async/);
+           expect(() => {
+             testZoneSpec.flushMicrotasks();
+           }).toThrowError(/Uncaught \(in promise\): Error: async/);
          });
        });
 
@@ -1169,7 +1171,7 @@ const {fakeAsync, tick, discardPeriodicTasks, flush, flushMicrotasks} = fakeAsyn
             resolvedPromise.then((_) => { throw new Error('async'); });
             flushMicrotasks();
           })();
-        }).toThrowError(/async/);
+        }).toThrowError(/Uncaught \(in promise\): Error: async/);
       });
 
       it('should complain if a test throws an exception', () => {