diff --git a/Octokit.Tests/Http/JsonHttpPipelineTests.cs b/Octokit.Tests/Http/JsonHttpPipelineTests.cs
index d8e839b4..f5d7cc06 100644
--- a/Octokit.Tests/Http/JsonHttpPipelineTests.cs
+++ b/Octokit.Tests/Http/JsonHttpPipelineTests.cs
@@ -1,7 +1,7 @@
 using System;
+using System.IO;
 using Octokit.Http;
 using Xunit;
-using Xunit.Extensions;
 
 namespace Octokit.Tests.Http
 {
@@ -55,6 +55,18 @@ namespace Octokit.Tests.Http
                 Assert.Equal(json, request.Body);
             }
 
+            [Fact]
+            public void LeavesStreamBodyAlone()
+            {
+                var stream = new MemoryStream();
+                var request = new Request { Body = stream };
+                var jsonPipeline = new JsonHttpPipeline();
+
+                jsonPipeline.SerializeRequest(request);
+
+                Assert.Same(stream, request.Body);
+            }
+
             [Fact]
             public void LeavesNullBodyAlone()
             {
diff --git a/Octokit/Http/JsonHttpPipeline.cs b/Octokit/Http/JsonHttpPipeline.cs
index 96726dcd..959c1238 100644
--- a/Octokit/Http/JsonHttpPipeline.cs
+++ b/Octokit/Http/JsonHttpPipeline.cs
@@ -1,4 +1,5 @@
 using System;
+using System.IO;
 using System.Net.Http;
 
 namespace Octokit.Http
@@ -35,7 +36,7 @@ namespace Octokit.Http
                 request.Headers["Accept"] = "application/vnd.github.manifold-preview; charset=utf-8";
 
             if (request.Method == HttpMethod.Get || request.Body == null) return;
-            if (request.Body is string) return;
+            if (request.Body is string || request.Body is Stream) return;
 
             request.Body = _serializer.Serialize(request.Body);
         }