diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
index e2a52eb0a8..5bb3fad607 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
@@ -874,7 +874,7 @@ class FrameworkExtension extends Extension
         // session storage
         $container->setAlias('session.storage', $config['storage_id'])->setPrivate(true);
         $options = ['cache_limiter' => '0'];
-        foreach (['name', 'cookie_lifetime', 'cookie_path', 'cookie_domain', 'cookie_secure', 'cookie_httponly', 'cookie_samesite', 'use_cookies', 'gc_maxlifetime', 'gc_probability', 'gc_divisor'] as $key) {
+        foreach (['name', 'cookie_lifetime', 'cookie_path', 'cookie_domain', 'cookie_secure', 'cookie_httponly', 'cookie_samesite', 'use_cookies', 'gc_maxlifetime', 'gc_probability', 'gc_divisor', 'sid_length', 'sid_bits_per_character'] as $key) {
             if (isset($config[$key])) {
                 $options[$key] = $config[$key];
             }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/php/full.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/php/full.php
index e02ba9183f..ee57706dde 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/php/full.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/php/full.php
@@ -37,6 +37,8 @@ $container->loadFromExtension('framework', [
         'gc_maxlifetime' => 90000,
         'gc_divisor' => 108,
         'gc_probability' => 1,
+        'sid_length' => 22,
+        'sid_bits_per_character' => 4,
         'save_path' => '/path/to/sessions',
     ],
     'assets' => [
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/xml/full.xml b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/xml/full.xml
index 905c187ef8..b2e55e27de 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/xml/full.xml
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/xml/full.xml
@@ -15,7 +15,7 @@
         <framework:ssi enabled="true" />
         <framework:profiler only-exceptions="true" enabled="false" />
         <framework:router resource="%kernel.project_dir%/config/routing.xml" type="xml" />
-        <framework:session gc-maxlifetime="90000" gc-probability="1" gc-divisor="108" storage-id="session.storage.native" handler-id="session.handler.native_file" name="_SYMFONY" cookie-lifetime="86400" cookie-path="/" cookie-domain="example.com" cookie-secure="true" cookie-httponly="false" use-cookies="true" save-path="/path/to/sessions" />
+        <framework:session gc-maxlifetime="90000" gc-probability="1" gc-divisor="108" storage-id="session.storage.native" handler-id="session.handler.native_file" name="_SYMFONY" cookie-lifetime="86400" cookie-path="/" cookie-domain="example.com" cookie-secure="true" cookie-httponly="false" use-cookies="true" save-path="/path/to/sessions" sid-length="22" sid-bits-per-character="4" />
         <framework:request>
             <framework:format name="csv">
                 <framework:mime-type>text/csv</framework:mime-type>
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/yml/full.yml b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/yml/full.yml
index 9194911b06..45c4a53b13 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/yml/full.yml
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/yml/full.yml
@@ -29,6 +29,8 @@ framework:
         gc_probability:  1
         gc_divisor:      108
         gc_maxlifetime:  90000
+        sid_length:      22
+        sid_bits_per_character: 4
         save_path:       /path/to/sessions
     assets:
         version: v1
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php
index 76d9d4ccfe..4e5bacc176 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php
@@ -530,6 +530,8 @@ abstract class FrameworkExtensionTest extends TestCase
         $this->assertEquals(108, $options['gc_divisor']);
         $this->assertEquals(1, $options['gc_probability']);
         $this->assertEquals(90000, $options['gc_maxlifetime']);
+        $this->assertEquals(22, $options['sid_length']);
+        $this->assertEquals(4, $options['sid_bits_per_character']);
 
         $this->assertEquals('/path/to/sessions', $container->getParameter('session.save_path'));
     }