diff --git a/km3buu/tests/test_output.py b/km3buu/tests/test_output.py
index d6ea63bea1f24a34bcff7670171606c1cb6fbaa4..6711897de15318d6d7717386c72db60ee1706e3e 100644
--- a/km3buu/tests/test_output.py
+++ b/km3buu/tests/test_output.py
@@ -118,7 +118,7 @@ class TestAANET(unittest.TestCase):
         np.testing.assert_allclose(evt.mc_tracks.pos_z, 208.57726764)
         usr = evt.mc_tracks.usr[0]
         # XSEC
-        np.testing.assert_almost_equal(evt.w2list[2], 40.62418521597373)
+        np.testing.assert_almost_equal(evt.w2list[13], 40.62418521597373)
         # Bx
         np.testing.assert_almost_equal(evt.w2list[7], 0.35479262672400624)
         # By