diff --git a/tests/php-unit-tests/unitary-tests/application/applicationextension/Delta/application-extension-usages-in-snippets.xml b/tests/php-unit-tests/unitary-tests/application/applicationextension/Delta/application-extension-usages-in-snippets.xml
index 3a80b4c47..beaadac93 100644
--- a/tests/php-unit-tests/unitary-tests/application/applicationextension/Delta/application-extension-usages-in-snippets.xml
+++ b/tests/php-unit-tests/unitary-tests/application/applicationextension/Delta/application-extension-usages-in-snippets.xml
@@ -359,7 +359,7 @@ class ExampleFor_iKPILoggerExtension implements \iKPILoggerExtension
       <content><![CDATA[
 class ExampleFor_iBackupExtraFilesExtension implements \iBackupExtraFilesExtension
 {
-	public function GetExtraFiles()
+	public function GetExtraFiles(): array
 	{
 		return [
 		  'foo'