diff --git a/src/Symfony/Component/DependencyInjection/Dumper/YamlDumper.php b/src/Symfony/Component/DependencyInjection/Dumper/YamlDumper.php
index db22888d22..149fd5b33f 100644
--- a/src/Symfony/Component/DependencyInjection/Dumper/YamlDumper.php
+++ b/src/Symfony/Component/DependencyInjection/Dumper/YamlDumper.php
@@ -99,7 +99,7 @@ class YamlDumper extends Dumper
         }
 
         if ($definition->isDeprecated()) {
-            $code .= sprintf("        deprecated: %s\n", $definition->getDeprecationMessage('%service_id%'));
+            $code .= sprintf("        deprecated: %s\n", $this->dumper->dump($definition->getDeprecationMessage('%service_id%')));
         }
 
         if ($definition->isAutowired()) {