diff --git a/templates/ObjectSerializer.mustache b/templates/ObjectSerializer.mustache
index a4a0691d9..227c4f621 100644
--- a/templates/ObjectSerializer.mustache
+++ b/templates/ObjectSerializer.mustache
@@ -5,6 +5,7 @@
 namespace {{modelPackage}};
 
 use {{modelPackage}}\ModelInterface;
+use GuzzleHttp\Utils;
 
 class ObjectSerializer
 {