diff --git a/tangostationcontrol/tangostationcontrol/test/beam/test_delays.py b/tangostationcontrol/tangostationcontrol/test/beam/test_delays.py
index a9c9babfa895cfaf07f707d4fc0fea027a2dd222..45412bd7ef08b4c343272f1b8f7cc81656a33099 100644
--- a/tangostationcontrol/tangostationcontrol/test/beam/test_delays.py
+++ b/tangostationcontrol/tangostationcontrol/test/beam/test_delays.py
@@ -39,7 +39,7 @@ class TestAttributeTypes(base.TestCase):
             pointing = d.measure.direction(*direction)
             dir = d.get_direction_vector(pointing)
 
-            self.assertTrue(0.95 <= sqrt(pow(dir[0],2) + pow(dir[1],2)) <= 1.05)
+            self.assertTrue(0.95 <= sqrt(pow(dir[0],2) + pow(dir[1],2)) <= 1.05, f"direction vector  x: {pow(dir[0],2)} y: {pow(dir[1],2)} z: {pow(dir[2],2)}")
 
     def test_identical_location(self):
         # # create a frame tied to the reference position