diff --git a/autoninja.py b/autoninja.py
index 52b506a0c..5aad538e3 100755
--- a/autoninja.py
+++ b/autoninja.py
@@ -141,4 +141,7 @@ for i in range(len(args)):
   if (i == 0 and sys.platform.startswith('win')) or ' ' in args[i]:
     args[i] = '"%s"' % args[i].replace('"', '\\"')
 
+if os.environ.get('NINJA_SUMMARIZE_BUILD', '0') == '1':
+  args += ['-d', 'stats']
+
 print(' '.join(args))