diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/ContainerDebugCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/ContainerDebugCommand.php
index 9b5193d63b..9debddcad7 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/ContainerDebugCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/ContainerDebugCommand.php
@@ -220,6 +220,8 @@ EOF
 
     private function findProperServiceName(InputInterface $input, SymfonyStyle $io, ContainerBuilder $builder, string $name, bool $showHidden)
     {
+        $name = ltrim($name, '\\');
+
         if ($builder->has($name) || !$input->isInteractive()) {
             return $name;
         }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/ContainerDebugCommandTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/ContainerDebugCommandTest.php
index ee13386a4b..61ffa68aed 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/ContainerDebugCommandTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/ContainerDebugCommandTest.php
@@ -85,6 +85,7 @@ class ContainerDebugCommandTest extends WebTestCase
         return [
             [BackslashClass::class],
             ['FixturesBackslashClass'],
+            ['\\'.BackslashClass::class],
         ];
     }
 }