diff --git a/tests/unit/aggregation/_inputs.py b/tests/unit/aggregation/_inputs.py
index dc5e619d3..beb9f1ff0 100644
--- a/tests/unit/aggregation/_inputs.py
+++ b/tests/unit/aggregation/_inputs.py
@@ -108,7 +108,7 @@ def _generate_semi_orthonormal_complement(Q: Tensor) -> Tensor:
 strong_stationary_matrices = [
     _generate_strong_stationary_matrix(m, n) for m, n in _stationary_matrices_shapes
 ]
-weak_stationary_matrices = strong_stationary_matrices + [
+weak_stationary_matrices = [
     _generate_weak_stationary_matrix(m, n) for m, n in _stationary_matrices_shapes
 ]
 typical_matrices = zero_matrices + matrices + weak_stationary_matrices + strong_stationary_matrices