diff --git a/src/Okta.Sdk/Client/DefaultDpopProofJwtGenerator.cs b/src/Okta.Sdk/Client/DefaultDpopProofJwtGenerator.cs
index bf2ce30b0..673741aa8 100644
--- a/src/Okta.Sdk/Client/DefaultDpopProofJwtGenerator.cs
+++ b/src/Okta.Sdk/Client/DefaultDpopProofJwtGenerator.cs
@@ -87,7 +87,7 @@ public string GenerateJwt(String? nonce = null, String? httpMethod = null, Strin
                     { "htm", httpMethod ?? "POST" },
                     { "htu", uri ?? $"{ClientUtils.EnsureTrailingSlash(_configuration.OktaDomain)}oauth2/v1/token" },
                     { "iat", (int)timeSpanIat.TotalSeconds },
-                    { "jti", Guid.NewGuid()}
+                    { "jti", Guid.NewGuid().ToString()}
                 };
 
                 if (!nonce.IsNullOrEmpty())