diff --git a/cmd/tsidp/tsidp.go b/cmd/tsidp/tsidp.go
index e2b777fa1..2d9450e96 100644
--- a/cmd/tsidp/tsidp.go
+++ b/cmd/tsidp/tsidp.go
@@ -795,7 +795,7 @@ type oidcTokenResponse struct {
 	IDToken      string `json:"id_token"`
 	TokenType    string `json:"token_type"`
 	AccessToken  string `json:"access_token"`
-	RefreshToken string `json:"refresh_token"`
+	RefreshToken string `json:"refresh_token,omitempty"`
 	ExpiresIn    int    `json:"expires_in"`
 }