diff --git a/lib/Rx/Operator/DelayOperator.php b/lib/Rx/Operator/DelayOperator.php
index 35ed780d..f94784f4 100644
--- a/lib/Rx/Operator/DelayOperator.php
+++ b/lib/Rx/Operator/DelayOperator.php
@@ -3,6 +3,7 @@
 namespace Rx\Operator;
 
 use Rx\Disposable\CompositeDisposable;
+use Rx\Disposable\EmptyDisposable;
 use Rx\ObservableInterface;
 use Rx\Observer\CallbackObserver;
 use Rx\ObserverInterface;
@@ -45,6 +46,8 @@ public function __invoke(
 
         $disposable = new CompositeDisposable();
 
+        $sourceDisposable = new EmptyDisposable();
+
         $sourceDisposable = $observable->subscribe(new CallbackObserver(
             function ($x) use ($scheduler, $observer, &$lastScheduledTime, $disposable) {
                 $schedDisp = $scheduler->schedule(function () use ($x, $observer, &$schedDisp, $disposable) {
@@ -68,8 +71,9 @@ function () use ($scheduler, $observer, $disposable, &$sourceDisposable) {
                 }, $this->delay);
 
                 $disposable->add($schedDisp);
-            }
-        ));
+            }),
+            $scheduler
+        );
 
         $disposable->add($sourceDisposable);
 
diff --git a/test/Rx/Functional/Operator/DelayTest.php b/test/Rx/Functional/Operator/DelayTest.php
index 89da8450..5a19d253 100644
--- a/test/Rx/Functional/Operator/DelayTest.php
+++ b/test/Rx/Functional/Operator/DelayTest.php
@@ -3,6 +3,7 @@
 namespace Rx\Functional\Operator;
 
 use Rx\Functional\FunctionalTestCase;
+use Rx\Observable;
 
 class DelayTest extends FunctionalTestCase
 {
@@ -270,4 +271,44 @@ public function delay_never()
             $xs->getSubscriptions()
         );
     }
+
+    /**
+     * @test
+     */
+    public function delay_scheduler_is_passed_to_source()
+    {
+        $schedulerPassedIn = null;
+
+        Observable::create(
+            function ($observer, $scheduler) use (&$schedulerPassedIn) {
+                $schedulerPassedIn = $scheduler;
+                $observer->onCompleted();
+            })
+            ->delay(1, $this->scheduler)
+            ->subscribeCallback();
+
+        $this->assertSame($schedulerPassedIn, $this->scheduler);
+    }
+
+    /**
+     * @test
+     */
+    public function delay_completes_during_subscribe_without_throwing()
+    {
+        $completes = false;
+
+        Observable::create(function ($observer, $scheduler) {
+            $observer->onCompleted();
+        })->delay(1, $this->scheduler)->subscribeCallback(
+            null,
+            null,
+            function () use (&$completes) {
+                $completes = true;
+            }
+        );
+
+        $this->scheduler->start();
+
+        $this->assertTrue($completes);
+    }
 }
\ No newline at end of file