diff --git a/Octokit.Tests/Clients/ReleasesClientTests.cs b/Octokit.Tests/Clients/ReleasesClientTests.cs
index 74436f73..92e146cc 100644
--- a/Octokit.Tests/Clients/ReleasesClientTests.cs
+++ b/Octokit.Tests/Clients/ReleasesClientTests.cs
@@ -75,9 +75,10 @@ namespace Octokit.Tests.Clients
 
                 releasesClient.UploadAsset(release, upload);
 
-                client.Received().Upload<ReleaseAsset>(Arg.Is<Uri>(u => u.ToString() == "https://uploads.test.dev/does/not/matter/releases/1/assets?name=example.zip"),
+                client.Received().Post<ReleaseAsset>(Arg.Is<Uri>(u => u.ToString() == "https://uploads.test.dev/does/not/matter/releases/1/assets?name=example.zip"),
                     rawData,
-                    Arg.Is<string>(contentType => contentType == "application/zip"));
+                    Arg.Is<string>(contentType => contentType == "application/zip"),
+                    "application/vnd.github.manifold-preview");
             }
 
             [Fact]
diff --git a/Octokit.Tests/Http/ApiConnectionTests.cs b/Octokit.Tests/Http/ApiConnectionTests.cs
index bafac540..4cde5e14 100644
--- a/Octokit.Tests/Http/ApiConnectionTests.cs
+++ b/Octokit.Tests/Http/ApiConnectionTests.cs
@@ -188,7 +188,7 @@ namespace Octokit.Tests.Http
                 var apiConnection = new ApiConnection(connection);
                 var rawData = new MemoryStream();
 
-                await apiConnection.Upload<string>(uploadUrl, rawData, "B");
+                await apiConnection.Post<string>(uploadUrl, rawData, "B", "anAccept");
 
                 connection.Received().PostAsync<string>(uploadUrl, rawData, Args.String, Args.String);
             }
@@ -197,9 +197,10 @@ namespace Octokit.Tests.Http
             public async Task EnsuresArgumentNotNull()
             {
                 var connection = new ApiConnection(Substitute.For<IConnection>());
-                await AssertEx.Throws<ArgumentNullException>(async () => await connection.Upload<object>(null, Stream.Null, "some-content-type"));
-                await AssertEx.Throws<ArgumentNullException>(async () => await connection.Upload<object>(new Uri("/ok", UriKind.Relative), null, "some-content-type"));
-                await AssertEx.Throws<ArgumentNullException>(async () => await connection.Upload<object>(new Uri("/ok", UriKind.Relative), null, null));
+                await AssertEx.Throws<ArgumentNullException>(async () => await connection.Post<object>(null, new MemoryStream(), "some-content-type", "anAccept"));
+                await AssertEx.Throws<ArgumentNullException>(async () => await connection.Post<object>(new Uri("/ok", UriKind.Relative), null, "some-content-type", "anAccept"));
+                await AssertEx.Throws<ArgumentNullException>(async () => await connection.Post<object>(new Uri("/ok", UriKind.Relative), new MemoryStream(), null, "anAccept"));
+                await AssertEx.Throws<ArgumentNullException>(async () => await connection.Post<object>(new Uri("/ok", UriKind.Relative), new MemoryStream(), "some-content-type", null));
             }
         }
 
diff --git a/Octokit/Clients/ReleasesClient.cs b/Octokit/Clients/ReleasesClient.cs
index 0d4e4703..3867eaac 100644
--- a/Octokit/Clients/ReleasesClient.cs
+++ b/Octokit/Clients/ReleasesClient.cs
@@ -1,6 +1,8 @@
 #if NET_45
 using System.Collections.Generic;
 #endif
+using System;
+using System.IO;
 using System.Threading.Tasks;
 
 namespace Octokit
@@ -38,7 +40,12 @@ namespace Octokit
             Ensure.ArgumentNotNull(data, "data");
 
             var endpoint = release.UploadUrl.ExpandUriTemplate(new { name = data.FileName });
-            return await Client.Upload<ReleaseAsset>(endpoint, data.RawData, data.ContentType);
+            return await Client.Post<ReleaseAsset>(
+                endpoint, 
+                data.RawData, 
+                data.ContentType, 
+                "application/vnd.github.manifold-preview");
         }
+
     }
 }
diff --git a/Octokit/Http/ApiConnection.cs b/Octokit/Http/ApiConnection.cs
index c7713da6..97dfd508 100644
--- a/Octokit/Http/ApiConnection.cs
+++ b/Octokit/Http/ApiConnection.cs
@@ -96,17 +96,18 @@ namespace Octokit
             await Connection.DeleteAsync<T>(endpoint);
         }
 
-        public async Task<TOther> Upload<TOther>(Uri uri, Stream rawData, string contentType)
+        public async Task<T> Post<T>(Uri uri, Stream rawData, string contentType, string accepts)
         {
             Ensure.ArgumentNotNull(uri, "uri");
             Ensure.ArgumentNotNull(rawData, "rawData");
             Ensure.ArgumentNotNull(contentType, "contentType");
+            Ensure.ArgumentNotNull(accepts, "accepts");
 
-            var response = await Connection.PostAsync<TOther>(
+            var response = await Connection.PostAsync<T>(
                 uri,
                 rawData,
                 contentType,
-                "application/vnd.github.manifold-preview");
+                accepts);
             return response.BodyAsObject;
         }
 
diff --git a/Octokit/Http/IApiConnection.cs b/Octokit/Http/IApiConnection.cs
index 4cce7997..ca14320b 100644
--- a/Octokit/Http/IApiConnection.cs
+++ b/Octokit/Http/IApiConnection.cs
@@ -22,6 +22,6 @@ namespace Octokit
         Task<T> Update<T>(Uri endpoint, object data);
         [SuppressMessage("Microsoft.Design", "CA1004:GenericMethodsShouldProvideTypeParameter", Justification="Legitimate, but I'm not fixing it just yet.")]
         Task Delete<T>(Uri endpoint);
-        Task<T> Upload<T>(Uri uri, Stream rawData, string contentType);
+        Task<T> Post<T>(Uri uri, Stream rawData, string contentType, string accepts);
     }
 }
\ No newline at end of file