diff --git a/src/Symfony/Component/Serializer/Mapping/Loader/YamlFileLoader.php b/src/Symfony/Component/Serializer/Mapping/Loader/YamlFileLoader.php
index f68807165d..1063a334a6 100644
--- a/src/Symfony/Component/Serializer/Mapping/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/Serializer/Mapping/Loader/YamlFileLoader.php
@@ -90,7 +90,7 @@ class YamlFileLoader extends FileLoader
 
                     if (isset($data['max_depth'])) {
                         if (!is_int($data['max_depth'])) {
-                            throw new MappingException('The "max_depth" value must an integer  in "%s" for the attribute "%s" of the class "%s".', $this->file, $attribute, $classMetadata->getName());
+                            throw new MappingException('The "max_depth" value must be an integer in "%s" for the attribute "%s" of the class "%s".', $this->file, $attribute, $classMetadata->getName());
                         }
 
                         $attributeMetadata->setMaxDepth($data['max_depth']);