diff --git a/examples/stackexchange-questions/server.php b/examples/stackexchange-questions/server.php
index e6a54c2..87e49e1 100644
--- a/examples/stackexchange-questions/server.php
+++ b/examples/stackexchange-questions/server.php
@@ -22,7 +22,7 @@
 use Amp\Websocket\Server\ClientHandler;
 use Amp\Websocket\Server\Gateway;
 use Amp\Websocket\Server\Websocket;
-use Amp\Websocket\Server\WebsocketObserver;
+use Amp\Websocket\Server\WebsocketServerObserver;
 use Monolog\Logger;
 use function Amp\ByteStream\getStdout;
 use function Amp\call;
@@ -30,7 +30,7 @@
 require __DIR__ . '/../../vendor/autoload.php';
 
 Loop::run(function (): Promise {
-    $websocket = new Websocket(new class implements ClientHandler, WebsocketObserver {
+    $websocket = new Websocket(new class implements ClientHandler, WebsocketServerObserver {
         /** @var string|null */
         private $watcher;
 
diff --git a/src/Websocket.php b/src/Websocket.php
index 53d486b..6700a8c 100644
--- a/src/Websocket.php
+++ b/src/Websocket.php
@@ -69,15 +69,15 @@ public function __construct(
         $this->compressionFactory = $compressionFactory ?? new Rfc7692CompressionFactory;
         $this->clientFactory = $clientFactory ?? new Rfc6455ClientFactory;
 
-        if ($this->clientHandler instanceof WebsocketObserver) {
+        if ($this->clientHandler instanceof WebsocketServerObserver) {
             $this->observers->attach($this->clientHandler);
         }
 
-        if ($this->clientFactory instanceof WebsocketObserver) {
+        if ($this->clientFactory instanceof WebsocketServerObserver) {
             $this->observers->attach($this->clientFactory);
         }
 
-        if ($this->compressionFactory instanceof WebsocketObserver) {
+        if ($this->compressionFactory instanceof WebsocketServerObserver) {
             $this->observers->attach($this->compressionFactory);
         }
     }
@@ -418,9 +418,9 @@ public function getOptions(): Options
     /**
      * Attaches a WebsocketObserver that is notified when the server starts and stops.
      *
-     * @param WebsocketObserver $observer
+     * @param WebsocketServerObserver $observer
      */
-    public function attach(WebsocketObserver $observer): void
+    public function attach(WebsocketServerObserver $observer): void
     {
         $this->observers->attach($observer);
     }
@@ -441,7 +441,7 @@ public function onStart(HttpServer $server): Promise
         return call(function () use ($server): \Generator {
             $onStartPromises = [];
             foreach ($this->observers as $observer) {
-                \assert($observer instanceof WebsocketObserver);
+                \assert($observer instanceof WebsocketServerObserver);
                 $onStartPromises[] = $observer->onStart($server, $this);
             }
 
@@ -461,7 +461,7 @@ public function onStop(HttpServer $server): Promise
         return call(function () use ($server): \Generator {
             $onStopPromises = [];
             foreach ($this->observers as $observer) {
-                \assert($observer instanceof WebsocketObserver);
+                \assert($observer instanceof WebsocketServerObserver);
                 $onStopPromises[] = $observer->onStop($server, $this);
             }
 
diff --git a/src/WebsocketObserver.php b/src/WebsocketServerObserver.php
similarity index 96%
rename from src/WebsocketObserver.php
rename to src/WebsocketServerObserver.php
index aed2208..331e25c 100644
--- a/src/WebsocketObserver.php
+++ b/src/WebsocketServerObserver.php
@@ -5,7 +5,7 @@
 use Amp\Http\Server\HttpServer;
 use Amp\Promise;
 
-interface WebsocketObserver
+interface WebsocketServerObserver
 {
     /**
      * Called when the HTTP server is started. If an instance of WebsocketObserver is attached to multiple
diff --git a/test/WebsocketTest.php b/test/WebsocketTest.php
index b3f65a3..75d16de 100644
--- a/test/WebsocketTest.php
+++ b/test/WebsocketTest.php
@@ -20,7 +20,7 @@
 use Amp\Websocket\Server\ClientHandler;
 use Amp\Websocket\Server\Gateway;
 use Amp\Websocket\Server\Websocket;
-use Amp\Websocket\Server\WebsocketObserver;
+use Amp\Websocket\Server\WebsocketServerObserver;
 use PHPUnit\Framework\MockObject\MockObject;
 use Psr\Http\Message\UriInterface as PsrUri;
 use Psr\Log\NullLogger;
@@ -297,7 +297,7 @@ public function testWebsocketObserverAttachment(): \Generator
 
         $webserver = new HttpServer([Server::listen('127.0.0.1:0')], $websocket, new NullLogger);
 
-        $observer = $this->createMock(WebsocketObserver::class);
+        $observer = $this->createMock(WebsocketServerObserver::class);
         $observer->expects($this->once())
             ->method('onStart')
             ->willReturn(new Success);