diff --git a/tests/gpu_tests/prepare_tests.py b/tests/gpu_tests/prepare_tests.py
index 01fc75b..d13753f 100644
--- a/tests/gpu_tests/prepare_tests.py
+++ b/tests/gpu_tests/prepare_tests.py
@@ -98,6 +98,7 @@ def run_analysis() -> None:
         activation_covariance_dtype=torch.float64,
         gradient_covariance_dtype=torch.float64,
         lambda_dtype=torch.float64,
+        lambda_iterative_aggregate=True,
     )
     analyzer.fit_all_factors(
         factors_name="single_gpu",