diff --git a/ocpp2.0.1/types/types.go b/ocpp2.0.1/types/types.go
index 5c20bc78..030a57af 100644
--- a/ocpp2.0.1/types/types.go
+++ b/ocpp2.0.1/types/types.go
@@ -262,7 +262,7 @@ type MessageContent struct {
 }
 
 type GroupIdToken struct {
-	IdToken string      `json:"idToken" validate:"required,max=36"`
+	IdToken string      `json:"idToken" validate:"max=36"`
 	Type    IdTokenType `json:"type" validate:"required,idTokenType"`
 }