diff --git a/tests/test_PostProcessing.py b/tests/test_PostProcessing.py
index 5c79a9009f6fd3797fdc9492efed5b1fdd79284a..6beeb2cecb8334971008d4c5b08dda1f4401a61b 100644
--- a/tests/test_PostProcessing.py
+++ b/tests/test_PostProcessing.py
@@ -108,7 +108,7 @@ def basic_engine_sequential():
     expdes = ExpDesigns(inp)
     expdes.n_init_samples = 4
     expdes.n_max_samples = 4
-    expdes.X = np.array([[0, 0], [1, 1], [0.5, 0.5], [0.1, 0.5]])  # Two input dimensions
+    expdes.X = np.array([[0], [1], [0.5], [0.1]]) 
     expdes.Y = {'Z': [[0.4], [0.5], [0.3], [0.4]]}  # Output values
     expdes.x_values = np.array([0])