diff --git a/dsf/org.eclipse.cdt.dsf/src/org/eclipse/cdt/dsf/concurrent/DsfExecutable.java b/dsf/org.eclipse.cdt.dsf/src/org/eclipse/cdt/dsf/concurrent/DsfExecutable.java
index bc31a0b0c79..0136d179d02 100644
--- a/dsf/org.eclipse.cdt.dsf/src/org/eclipse/cdt/dsf/concurrent/DsfExecutable.java
+++ b/dsf/org.eclipse.cdt.dsf/src/org/eclipse/cdt/dsf/concurrent/DsfExecutable.java
@@ -26,7 +26,7 @@ import org.eclipse.core.runtime.Platform;
  * 
  * @since 1.0
  */
-@Immutable
+@ThreadSafe
 public class DsfExecutable {
     /** 
      * Flag indicating that tracing of the DSF executor is enabled.  It enables