diff --git a/test/test_sfg_generators.py b/test/test_sfg_generators.py
index 40dd973f792319b667e9a6d723633e7de28a04c2..e3430bc40c9e79636f40e1e077c092c4b9944c04 100644
--- a/test/test_sfg_generators.py
+++ b/test/test_sfg_generators.py
@@ -744,7 +744,7 @@ class TestLdltMatrixInverse:
             assert np.isclose(actual_values[i], expected_values[i])
 
     def test_20x20_random_spd(self):
-        N = 30
+        N = 20
 
         sfg = ldlt_matrix_inverse(N=N, is_complex=False)