diff --git a/Octokit.Tests/Clients/AuthorizationsClientTests.cs b/Octokit.Tests/Clients/AuthorizationsClientTests.cs
index 0ce69804..05646ef3 100644
--- a/Octokit.Tests/Clients/AuthorizationsClientTests.cs
+++ b/Octokit.Tests/Clients/AuthorizationsClientTests.cs
@@ -252,11 +252,13 @@ namespace Octokit.Tests.Clients
                 var client = Substitute.For<IApiConnection>();
                 var authEndpoint = new AuthorizationsClient(client);
 
-                var result = await authEndpoint.CheckApplicationAuthentication("clientId", "accessToken");
+                authEndpoint.CheckApplicationAuthentication("clientId", "accessToken");
 
                 client.Received().Get<ApplicationAuthorization>(
-                    Arg.Is<Uri>(u => u.ToString() == "applications/clientId/tokens/accessToken"));
-            }
+                    Arg.Is<Uri>(u => u.ToString() == "applications/clientId/tokens/accessToken"),
+                    null,
+                    Arg.Any<string>());
+           }
 
             [Fact]
             public async Task EnsuresArgumentsNotNull()
diff --git a/Octokit/Clients/AuthorizationsClient.cs b/Octokit/Clients/AuthorizationsClient.cs
index d3b4697f..1eea4c7b 100644
--- a/Octokit/Clients/AuthorizationsClient.cs
+++ b/Octokit/Clients/AuthorizationsClient.cs
@@ -192,7 +192,9 @@ namespace Octokit
 
             var endpoint = ApiUrls.ApplicationAuthorization(clientId, accessToken);
             return await ApiConnection.Get<ApplicationAuthorization>(
-                endpoint);
+                endpoint,
+                null,
+                previewAcceptsHeader);
         }
 
         /// <summary>