diff --git a/recipes/engine_v2/builder.py b/recipes/engine_v2/builder.py
index 3c8e113..32c317a 100644
--- a/recipes/engine_v2/builder.py
+++ b/recipes/engine_v2/builder.py
@@ -98,8 +98,8 @@
 def _should_run_test(test, branch):
   """Whether the current test should on this branch."""
   # Default to wildcard to run tests everywhere.
-  test_if = test.get('test_if', '.*')
-  regex = re.compile(test_if)
+  test_if = test.get('test_if', '')
+  regex = re.compile(f'.*{test_if}')
   return regex.match(branch)