diff --git a/scripts/tests/test_aodf_metrics.py b/scripts/tests/test_aodf_metrics.py
index 5e974b926..54a94655d 100644
--- a/scripts/tests/test_aodf_metrics.py
+++ b/scripts/tests/test_aodf_metrics.py
@@ -73,5 +73,5 @@ def test_execution_symmetric_input(script_runner, monkeypatch):
     ret = script_runner.run('scil_aodf_metrics.py', in_fodf,
                             '--sphere', 'repulsion100', '--not_all',
                             '--nufid', 'nufid.nii.gz',
-                            '--processes', '2')
+                            '--processes', '1')
     assert not ret.success