diff --git a/CodeSnippetsReflection.OpenAPI.Test/PhpImportGeneratorTests.cs b/CodeSnippetsReflection.OpenAPI.Test/PhpImportGeneratorTests.cs
index 17abf6ae3..6ee34984c 100644
--- a/CodeSnippetsReflection.OpenAPI.Test/PhpImportGeneratorTests.cs
+++ b/CodeSnippetsReflection.OpenAPI.Test/PhpImportGeneratorTests.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Net.Http;
 using System.Text;
 using System.Threading.Tasks;