diff --git a/test/detector_tests.py b/test/detector_tests.py
index fe30b523427461123812ec53680ea3cf39147e7f..346f59f411f25f1894ee2f59d7749d416cd22d7a 100644
--- a/test/detector_tests.py
+++ b/test/detector_tests.py
@@ -381,7 +381,7 @@ class TestDetector(unittest.TestCase):
             self.assertEqual(self.ifo.time_delay_from_geocenter(1, 2, 3), 1)
 
     def test_vertex_position_geocentric(self):
-        with mock.patch('tupak.utils.vertex_position_geocentric') as m:
+        with mock.patch('tupak.utils.get_vertex_position_geocentric') as m:
             m.return_value = 1
             self.assertEqual(self.ifo.vertex_position_geocentric(), 1)