diff --git a/src/DependencyInjection/FOSElasticaExtension.php b/src/DependencyInjection/FOSElasticaExtension.php
index e849d47de..5911c2d7f 100644
--- a/src/DependencyInjection/FOSElasticaExtension.php
+++ b/src/DependencyInjection/FOSElasticaExtension.php
@@ -210,7 +210,7 @@ private function loadIndexes(array $indexes, ContainerBuilder $container): void
             $container->registerAliasForArgument(
                 $indexId,
                 Index::class,
-                sprintf('%s.%s', $name, 'index')
+                \sprintf('%s.%s', $name, 'index')
             )->setPublic(true);
 
             if (isset($index['client'])) {
@@ -662,7 +662,7 @@ private function loadTypeFinder(array $typeConfig, ContainerBuilder $container,
             $container->registerAliasForArgument(
                 $finderId,
                 TransformedFinder::class,
-                sprintf('%s.%s', $indexName, 'finder')
+                \sprintf('%s.%s', $indexName, 'finder')
             )->setPublic(true);
         }