diff --git a/problemtools/verifyproblem.py b/problemtools/verifyproblem.py
index eed76615..5f76b76a 100644
--- a/problemtools/verifyproblem.py
+++ b/problemtools/verifyproblem.py
@@ -479,6 +479,9 @@ def __init__(self, problem: Problem, datadir: str | None = None, parent: TestCas
         if not parent:
             self.set_symlinks()
 
+    def start_background_work(self, context: Context) -> None:
+        pass
+
     def __str__(self) -> str:
         return f'testcase group {self.name}'