diff --git a/src/tools/testing.py b/src/tools/testing.py
index 868905a05..b634bea28 100644
--- a/src/tools/testing.py
+++ b/src/tools/testing.py
@@ -113,7 +113,7 @@ def make_test(target_type, sources, requirements, target_name=None):
 
     # The alias to the real target, per period replacement above.
     if real_name != target_name:
-        get_manager().projects().project_rules().all_names_["alias"](
+        get_manager().projects().project_rules().rules["alias"](
             target_name, [t])
 
     # Remember the test (for --dump-tests). A good way would be to collect all