diff --git a/src/commands/CommandTargets.h b/src/commands/CommandTargets.h
index b4086b4d8..30c85e83e 100644
--- a/src/commands/CommandTargets.h
+++ b/src/commands/CommandTargets.h
@@ -293,7 +293,7 @@ public:
 /// mProgressTarget is a unique pointer, but mStatusTraget and
 /// mErrorTarget are shared ones, because they may both point to the same 
 /// output 
-class CommandOutputTargets
+class CommandOutputTargets /* not final */
 {
 public:
    std::unique_ptr<CommandProgressTarget> mProgressTarget;