diff --git a/openfisca_core/tools/test_runner.py b/openfisca_core/tools/test_runner.py
index 1e4917155..d5dc708a3 100644
--- a/openfisca_core/tools/test_runner.py
+++ b/openfisca_core/tools/test_runner.py
@@ -258,6 +258,8 @@ def runtest(self) -> None:
         finally:
             tracer = self.simulation.tracer
             if verbose:
+                if max_depth is None:
+                    max_depth = sys.maxsize  # Print full tree
                 self.print_computation_log(tracer, aggregate, max_depth)
             if performance_graph:
                 self.generate_performance_graph(tracer)