diff --git a/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/core/ManagedBuilderCorePlugin.java b/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/core/ManagedBuilderCorePlugin.java
index 2945efda446..758fb6beaf7 100644
--- a/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/core/ManagedBuilderCorePlugin.java
+++ b/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/core/ManagedBuilderCorePlugin.java
@@ -118,6 +118,7 @@ public class ManagedBuilderCorePlugin extends Plugin {
 			
 			rcJob.setRule(root);
 			rcJob.setPriority(Job.INTERACTIVE);
+			rcJob.setSystem(true);
 			rcJob.schedule();
 
 		} finally {