diff --git a/tangostationcontrol/test/devices/sdp/test_beamlet_device.py b/tangostationcontrol/test/devices/sdp/test_beamlet_device.py
index f5166079e730e41c39390b06ced286af9716f95e..3dc32d764129ed3b914283867e8b51d0e2b6de4e 100644
--- a/tangostationcontrol/test/devices/sdp/test_beamlet_device.py
+++ b/tangostationcontrol/test/devices/sdp/test_beamlet_device.py
@@ -178,7 +178,7 @@ class TestBeamletDevice(base.TestCase):
     def test_beamlet_frequencies_basic(self):
         beamlet_subbands = numpy.array(
             [
-                [[beamlet % N_subbands for beamlet in range(N_beamlets_ctrl)] * N_pol]
+                [[[beamlet % N_subbands for beamlet in range(N_beamlets_ctrl)]] * N_pol]
                 * A_pn
             ]
             * N_pn,
@@ -196,7 +196,7 @@ class TestBeamletDevice(base.TestCase):
 
         beamlet_subbands = numpy.array(
             [
-                [[beamlet % N_subbands for beamlet in range(N_beamlets_ctrl)] * N_pol]
+                [[[beamlet % N_subbands for beamlet in range(N_beamlets_ctrl)]] * N_pol]
                 * A_pn
             ]
             * N_pn,
@@ -217,7 +217,7 @@ class TestBeamletDevice(base.TestCase):
 
         beamlet_subbands = numpy.array(
             [
-                [[beamlet % N_subbands for beamlet in range(N_beamlets_ctrl)] * N_pol]
+                [[[beamlet % N_subbands for beamlet in range(N_beamlets_ctrl)]] * N_pol]
                 * A_pn
             ]
             * N_pn,
@@ -238,7 +238,7 @@ class TestBeamletDevice(base.TestCase):
 
         beamlet_subbands = numpy.array(
             [
-                [[beamlet % N_subbands for beamlet in range(N_beamlets_ctrl)] * N_pol]
+                [[[beamlet % N_subbands for beamlet in range(N_beamlets_ctrl)]] * N_pol]
                 * A_pn
             ]
             * N_pn,