diff --git a/src/Loop/Events/Signal.php b/src/Loop/Events/Signal.php
index 4eb6c78..abf6a0c 100644
--- a/src/Loop/Events/Signal.php
+++ b/src/Loop/Events/Signal.php
@@ -57,6 +57,14 @@ public function __invoke()
         $this->call();
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function setCallback(callable $callback)
+    {
+        $this->callback = $callback;
+    }
+
     /**
      * {@inheritdoc}
      */
diff --git a/src/Loop/Events/SignalInterface.php b/src/Loop/Events/SignalInterface.php
index 2afaa4e..03e46e7 100644
--- a/src/Loop/Events/SignalInterface.php
+++ b/src/Loop/Events/SignalInterface.php
@@ -21,6 +21,11 @@ public function call();
      */
     public function __invoke();
 
+    /**
+     * @param callable $callback
+     */
+    public function setCallback(callable $callback);
+
     /**
      * Enables listening for the signal.
      */
diff --git a/src/Loop/Events/SocketEvent.php b/src/Loop/Events/SocketEvent.php
index 7383f9a..fc3f0e6 100644
--- a/src/Loop/Events/SocketEvent.php
+++ b/src/Loop/Events/SocketEvent.php
@@ -67,6 +67,14 @@ public function __invoke($expired)
         $this->call($expired);
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function setCallback(callable $callback)
+    {
+        $this->callback = $callback;
+    }
+
     /**
      * {@inheritdoc}
      */
diff --git a/src/Loop/Events/SocketEventInterface.php b/src/Loop/Events/SocketEventInterface.php
index 31735e9..0c6b833 100644
--- a/src/Loop/Events/SocketEventInterface.php
+++ b/src/Loop/Events/SocketEventInterface.php
@@ -28,6 +28,11 @@ public function call($expired);
      */
     public function __invoke($expired);
 
+    /**
+     * @param callable $callback
+     */
+    public function setCallback(callable $callback);
+
     /**
      * Listens for data or the ability to write.
      *
diff --git a/tests/Loop/Events/SignalTest.php b/tests/Loop/Events/SignalTest.php
index 11fb8bb..4d2a529 100644
--- a/tests/Loop/Events/SignalTest.php
+++ b/tests/Loop/Events/SignalTest.php
@@ -69,6 +69,25 @@ public function testInvoke()
         $signal();
     }
 
+    /**
+     * @depends testCall
+     */
+    public function testSetCallback()
+    {
+        $signo = 1;
+
+        $callback = $this->createCallback(2);
+        $callback->method('__invoke')
+            ->with($this->identicalTo($signo));
+
+        $signal = $this->createSignal($signo, $this->createCallback(0));
+
+        $signal->setCallback($callback);
+
+        $signal->call();
+        $signal->call();
+    }
+
     public function testEnable()
     {
         $signal = $this->createSignal(1, $this->createCallback(0));
diff --git a/tests/Loop/Events/SocketEventTest.php b/tests/Loop/Events/SocketEventTest.php
index bd57c1f..9f2bf67 100644
--- a/tests/Loop/Events/SocketEventTest.php
+++ b/tests/Loop/Events/SocketEventTest.php
@@ -95,6 +95,25 @@ public function testListen()
         
         $event->listen();
     }
+
+    /**
+     * @depends testCall
+     */
+    public function testSetCallback()
+    {
+        list($socket) = $this->createSockets();
+
+        $callback = $this->createCallback(2);
+        $callback->method('__invoke')
+            ->with($this->identicalTo($socket), $this->identicalTo(false));
+
+        $event = $this->createSocketEvent($socket, $this->createCallback(0));
+
+        $event->setCallback($callback);
+
+        $event->call(false);
+        $event->call(false);
+    }
     
     /**
      * @depends testListen