diff --git a/SConstruct b/SConstruct
index a9739ca604c..129b32f5f93 100644
--- a/SConstruct
+++ b/SConstruct
@@ -11,7 +11,7 @@ import multiprocessing
 # Enable aggresive compile mode if building on a multi core box
 # only is we have not set the number of jobs already or we do
 # not want it
-if ARGUMENTS.get('spawn_jobs', 'yes') == 'yes' and \
+if ARGUMENTS.get('spawn_jobs', 'no') == 'yes' and \
 	int(GetOption('num_jobs')) <= 1:
 	NUM_JOBS = multiprocessing.cpu_count()
 	if NUM_JOBS > 1: