diff --git a/src/Symfony/Component/Notifier/Bridge/RocketChat/RocketChatTransport.php b/src/Symfony/Component/Notifier/Bridge/RocketChat/RocketChatTransport.php
index 79cfd1d502917..ef2f68b0fb4c3 100644
--- a/src/Symfony/Component/Notifier/Bridge/RocketChat/RocketChatTransport.php
+++ b/src/Symfony/Component/Notifier/Bridge/RocketChat/RocketChatTransport.php
@@ -43,6 +43,10 @@ public function __construct(string $accessToken, string $chatChannel = null, Htt
 
     public function __toString(): string
     {
+        if (null === $this->chatChannel) {
+            return sprintf('rocketchat://%s', $this->getEndpoint());
+        }
+
         return sprintf('rocketchat://%s?channel=%s', $this->getEndpoint(), $this->chatChannel);
     }
 
diff --git a/src/Symfony/Component/Notifier/Bridge/RocketChat/Tests/RocketChatTransportTest.php b/src/Symfony/Component/Notifier/Bridge/RocketChat/Tests/RocketChatTransportTest.php
index f28e57ff52287..87ec4e563a88e 100644
--- a/src/Symfony/Component/Notifier/Bridge/RocketChat/Tests/RocketChatTransportTest.php
+++ b/src/Symfony/Component/Notifier/Bridge/RocketChat/Tests/RocketChatTransportTest.php
@@ -30,6 +30,13 @@ public function testToStringContainsProperties()
         $this->assertSame('rocketchat://host.test?channel=testChannel', (string) $transport);
     }
 
+    public function testToStringContainsNoChannelBecauseItsOptional()
+    {
+        $transport = $this->createTransport(null);
+
+        $this->assertSame('rocketchat://host.test', (string) $transport);
+    }
+
     public function testSupportsChatMessage()
     {
         $transport = $this->createTransport();
@@ -46,8 +53,8 @@ public function testSendNonChatMessageThrowsLogicException()
         $transport->send($this->createMock(MessageInterface::class));
     }
 
-    private function createTransport(): RocketChatTransport
+    private function createTransport(?string $channel = 'testChannel'): RocketChatTransport
     {
-        return (new RocketChatTransport('testAccessToken', 'testChannel', $this->createMock(HttpClientInterface::class)))->setHost('host.test');
+        return (new RocketChatTransport('testAccessToken', $channel, $this->createMock(HttpClientInterface::class)))->setHost('host.test');
     }
 }
diff --git a/src/Symfony/Component/Notifier/Bridge/Telegram/TelegramTransport.php b/src/Symfony/Component/Notifier/Bridge/Telegram/TelegramTransport.php
index b736cccb54617..c5f8524c84171 100644
--- a/src/Symfony/Component/Notifier/Bridge/Telegram/TelegramTransport.php
+++ b/src/Symfony/Component/Notifier/Bridge/Telegram/TelegramTransport.php
@@ -48,6 +48,10 @@ public function __construct(string $token, string $channel = null, HttpClientInt
 
     public function __toString(): string
     {
+        if (null === $this->chatChannel) {
+            return sprintf('telegram://%s', $this->getEndpoint());
+        }
+
         return sprintf('telegram://%s?channel=%s', $this->getEndpoint(), $this->chatChannel);
     }
 
diff --git a/src/Symfony/Component/Notifier/Bridge/Telegram/Tests/TelegramTransportTest.php b/src/Symfony/Component/Notifier/Bridge/Telegram/Tests/TelegramTransportTest.php
index ededeec27fa32..1cd15d2eacb36 100644
--- a/src/Symfony/Component/Notifier/Bridge/Telegram/Tests/TelegramTransportTest.php
+++ b/src/Symfony/Component/Notifier/Bridge/Telegram/Tests/TelegramTransportTest.php
@@ -31,6 +31,13 @@ public function testToStringContainsProperties()
         $this->assertSame('telegram://host.test?channel=testChannel', (string) $transport);
     }
 
+    public function testToStringContainsNoChannelBecauseItsOptional()
+    {
+        $transport = $this->createTransport(null);
+
+        $this->assertSame('telegram://host.test', (string) $transport);
+    }
+
     public function testSupportsChatMessage()
     {
         $transport = $this->createTransport();
@@ -186,7 +193,7 @@ public function testSendWithChannelOverride()
         $this->assertEquals('telegram://host.test?channel=defaultChannel', $sentMessage->getTransport());
     }
 
-    private function createTransport($channel = 'testChannel', ?HttpClientInterface $client = null): TelegramTransport
+    private function createTransport(?string $channel = 'testChannel', ?HttpClientInterface $client = null): TelegramTransport
     {
         return (new TelegramTransport('token', $channel, $client ?: $this->createMock(HttpClientInterface::class)))->setHost('host.test');
     }

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