1 files changed, 1 insertions, 1 deletions

diff --git a/src/WixToolset.Core/HeatCore.cs b/src/WixToolset.Core/HeatCore.cs
index 8e02a7b5..d43b5f3d 100644
--- a/src/WixToolset.Core/HeatCore.cs
+++ b/src/WixToolset.Core/HeatCore.cs
@@ -7,7 +7,7 @@ namespace WixToolset.Core
     /// <summary>
     /// The WiX Toolset Harvester application core.
     /// </summary>
-    public sealed class HeatCore : IHeatCore
+    public class HeatCore : IHeatCore
     {
         private Harvester harvester;
         private Mutator mutator;