1 files changed, 1 insertions, 1 deletions

diff --git a/src/WixToolset.BuildTasks/ToolsetTask.cs b/src/WixToolset.BuildTasks/ToolsetTask.cs
index ae11254a..6b171eb0 100644
--- a/src/WixToolset.BuildTasks/ToolsetTask.cs
+++ b/src/WixToolset.BuildTasks/ToolsetTask.cs
@@ -29,7 +29,7 @@ namespace WixToolset.BuildTasks
         /// Gets or sets a flag indicating whether the task
         /// should be run as separate process or in-proc.
         /// </summary>
-        public bool RunAsSeparateProcess { get; set; }
+        public virtual bool RunAsSeparateProcess { get; set; }
 
         /// <summary>
         /// Gets or sets whether all warnings should be suppressed.