diff --git a/test/api/python_lvm_unit.py b/test/api/python_lvm_unit.py
index c33877512..2f22fae23 100755
--- a/test/api/python_lvm_unit.py
+++ b/test/api/python_lvm_unit.py
@@ -103,7 +103,7 @@ class AllowedPVS(object):
 
 class TestLvm(unittest.TestCase):
 
-	VG_P = 'py_unit_test_'
+	VG_P = os.environ.get('PREFIX')
 
 	@staticmethod
 	def _get_pv_device_names():