diff --git a/test/core/test_performance.py b/test/core/test_performance.py
index e380aed1..e4883167 100644
--- a/test/core/test_performance.py
+++ b/test/core/test_performance.py
@@ -72,7 +72,7 @@ def __preinit__(self):
                     core_util.connect_all_interfaces(
                         r.unnamed[0] for r in self.resistors
                     )
-                    timings.add("connect")
+                    self._timings.add("connect")
 
             return App