diff --git a/Src/Common/RootSite/RootSiteTests/RenderTimingSuiteTests.cs b/Src/Common/RootSite/RootSiteTests/RenderTimingSuiteTests.cs
index ef07c20da5..60900efc95 100644
--- a/Src/Common/RootSite/RootSiteTests/RenderTimingSuiteTests.cs
+++ b/Src/Common/RootSite/RootSiteTests/RenderTimingSuiteTests.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Threading;
 using NUnit.Framework;
 using SIL.FieldWorks.Common.RootSites.RenderBenchmark;
 using SIL.FieldWorks.Common.RenderVerification;
@@ -15,6 +16,7 @@ namespace SIL.FieldWorks.Common.RootSites
 	[TestFixture]
 	[Category("RenderBenchmark")]
 	[Category("Performance")]
+	[Apartment(ApartmentState.STA)]
 	public class RenderTimingSuiteTests : RenderBenchmarkTestsBase
 	{
 		private static List<BenchmarkResult> m_results;
diff --git a/Src/Common/RootSite/RootSiteTests/RenderVerifyTests.cs b/Src/Common/RootSite/RootSiteTests/RenderVerifyTests.cs
index 82b7c97080..893f1bef07 100644
--- a/Src/Common/RootSite/RootSiteTests/RenderVerifyTests.cs
+++ b/Src/Common/RootSite/RootSiteTests/RenderVerifyTests.cs
@@ -3,6 +3,7 @@
 // (http://www.gnu.org/licenses/lgpl-2.1.html)
 
 using System.Collections.Generic;
+using System.Threading;
 using System.Threading.Tasks;
 using NUnit.Framework;
 using SIL.FieldWorks.Common.RootSites.RenderBenchmark;
@@ -22,6 +23,7 @@ namespace SIL.FieldWorks.Common.RootSites
 	/// </summary>
 	[TestFixture]
 	[Category("RenderBenchmark")]
+	[Apartment(ApartmentState.STA)]
 	public class RenderVerifyTests : RenderBenchmarkTestsBase
 	{
 		/// <summary>