diff --git a/pkg/client/rp/device.go b/pkg/client/rp/device.go
index 788e23e..390c8cf 100644
--- a/pkg/client/rp/device.go
+++ b/pkg/client/rp/device.go
@@ -12,7 +12,6 @@ import (
 func newDeviceClientCredentialsRequest(scopes []string, rp RelyingParty) (*oidc.ClientCredentialsRequest, error) {
 	confg := rp.OAuthConfig()
 	req := &oidc.ClientCredentialsRequest{
-		GrantType:    oidc.GrantTypeDeviceCode,
 		Scope:        scopes,
 		ClientID:     confg.ClientID,
 		ClientSecret: confg.ClientSecret,
diff --git a/pkg/oidc/token_request.go b/pkg/oidc/token_request.go
index 6b6945a..5c5cf20 100644
--- a/pkg/oidc/token_request.go
+++ b/pkg/oidc/token_request.go
@@ -241,7 +241,7 @@ type TokenExchangeRequest struct {
 }
 
 type ClientCredentialsRequest struct {
-	GrantType           GrantType           `schema:"grant_type"`
+	GrantType           GrantType           `schema:"grant_type,omitempty"`
 	Scope               SpaceDelimitedArray `schema:"scope"`
 	ClientID            string              `schema:"client_id"`
 	ClientSecret        string              `schema:"client_secret"`