diff --git a/tools/run_perf.py b/tools/run_perf.py
index 2bd4372453..a922b8ad0c 100755
--- a/tools/run_perf.py
+++ b/tools/run_perf.py
@@ -389,6 +389,7 @@ class DefaultSentinel(Node):
     self.stddev_regexp = None
     self.units = "score"
     self.total = False
+    self.owners = []
 
 
 class GraphConfig(Node):