diff --git a/src/NzbDrone.Core.Test/UpdateTests/UpdateServiceFixture.cs b/src/NzbDrone.Core.Test/UpdateTests/UpdateServiceFixture.cs
index 810dc8661..f02a8368d 100644
--- a/src/NzbDrone.Core.Test/UpdateTests/UpdateServiceFixture.cs
+++ b/src/NzbDrone.Core.Test/UpdateTests/UpdateServiceFixture.cs
@@ -24,7 +24,7 @@ public class UpdateServiceFixture : CoreTest<InstallUpdateService>
         private readonly UpdatePackage _updatePackage = new UpdatePackage
         {
             FileName = "NzbDrone.develop.2.0.0.zip",
-            Url = "http://update.nzbdrone.com/v2/develop/NzbDrone.develop.zip",
+            Url = "http://update.nzbdrone.com/v2/develop/windows/NzbDrone.develop.zip",
             Version = new Version("2.0.0")
         };
 
diff --git a/src/NzbDrone.Core/Update/UpdatePackageProvider.cs b/src/NzbDrone.Core/Update/UpdatePackageProvider.cs
index e95d4c6fa..0b436adfb 100644
--- a/src/NzbDrone.Core/Update/UpdatePackageProvider.cs
+++ b/src/NzbDrone.Core/Update/UpdatePackageProvider.cs
@@ -22,6 +22,7 @@ public UpdatePackage GetLatestUpdate(string branch, Version currentVersion)
             var request = new RestRequest("/v1/update/{branch}");
 
             request.AddParameter("version", currentVersion);
+            request.AddParameter("os", OsInfo.Os.ToString().ToLowerInvariant());
             request.AddUrlSegment("branch", branch);
 
             var update = restClient.ExecuteAndValidate<UpdatePackageAvailable>(request);
@@ -38,6 +39,7 @@ public List<UpdatePackage> GetRecentUpdates(string branch)
             var request = new RestRequest("/v1/update/{branch}/changes");
 
             request.AddParameter("majorVersion", BuildInfo.Version.Major);
+            request.AddParameter("os", OsInfo.Os.ToString().ToLowerInvariant());
             request.AddUrlSegment("branch", branch);
 
             var updates = restClient.ExecuteAndValidate<List<UpdatePackage>>(request);