diff --git a/UrlboxSDK.MsTest/UrlboxTest.cs b/UrlboxSDK.MsTest/UrlboxTest.cs
index 0ffdd7e..3b0a37b 100644
--- a/UrlboxSDK.MsTest/UrlboxTest.cs
+++ b/UrlboxSDK.MsTest/UrlboxTest.cs
@@ -307,6 +307,7 @@ public void GenerateRenderLink_IgnoreEmptyValuesAndFormat()
     public void GenerateSignedRenderLink_Succeeds()
     {
         UrlboxOptions options = new(url: "https://bbc.co.uk");
+        options.Format = Format.Jpeg;
         string output = urlbox.GenerateSignedRenderLink(options);
         Assert.AreEqual("https://api.urlbox.com/v1/MY_API_KEY/8e00ad9a8d7c4abcd462a9b8ec041c3661f13995/jpeg?url=https%3A%2F%2Fbbc.co.uk", output, "Not OK!");
     }