diff --git a/src/Symfony/Component/HttpClient/CurlHttpClient.php b/src/Symfony/Component/HttpClient/CurlHttpClient.php
index 8a87e29d3f..9cb7fb5295 100644
--- a/src/Symfony/Component/HttpClient/CurlHttpClient.php
+++ b/src/Symfony/Component/HttpClient/CurlHttpClient.php
@@ -267,7 +267,14 @@ final class CurlHttpClient implements HttpClientInterface, LoggerAwareInterface,
         }
 
         if ($options['bindto']) {
-            $curlopts[file_exists($options['bindto']) ? \CURLOPT_UNIX_SOCKET_PATH : \CURLOPT_INTERFACE] = $options['bindto'];
+            if (file_exists($options['bindto'])) {
+                $curlopts[\CURLOPT_UNIX_SOCKET_PATH] = $options['bindto'];
+            } elseif (preg_match('/^(.*):(\d+)$/', $options['bindto'], $matches)) {
+                $curlopts[\CURLOPT_INTERFACE] = $matches[1];
+                $curlopts[\CURLOPT_LOCALPORT] = $matches[2];
+            } else {
+                $curlopts[\CURLOPT_INTERFACE] = $options['bindto'];
+            }
         }
 
         if (0 < $options['max_duration']) {
diff --git a/src/Symfony/Component/HttpClient/Tests/CurlHttpClientTest.php b/src/Symfony/Component/HttpClient/Tests/CurlHttpClientTest.php
index 45362b1195..6793818d55 100644
--- a/src/Symfony/Component/HttpClient/Tests/CurlHttpClientTest.php
+++ b/src/Symfony/Component/HttpClient/Tests/CurlHttpClientTest.php
@@ -35,6 +35,21 @@ class CurlHttpClientTest extends HttpClientTestCase
         return new CurlHttpClient();
     }
 
+    public function testBindToPort()
+    {
+        $client = $this->getHttpClient(__FUNCTION__);
+        $response = $client->request('GET', 'http://localhost:8057', ['bindto' => '127.0.0.1:9876']);
+        $response->getStatusCode();
+
+        $r = new \ReflectionProperty($response, 'handle');
+        $r->setAccessible(true);
+
+        $curlInfo = curl_getinfo($r->getValue($response));
+
+        self::assertSame('127.0.0.1', $curlInfo['local_ip']);
+        self::assertSame(9876, $curlInfo['local_port']);
+    }
+
     /**
      * @requires PHP 7.2.17
      */