diff --git a/unittest/python/test_user_type.py b/unittest/python/test_user_type.py
index 057cfe95a6896d3ffbe2b46ab68bcf6d538e5340..8ae8cc12654351d4e61f15a043cd512ebd554783 100644
--- a/unittest/python/test_user_type.py
+++ b/unittest/python/test_user_type.py
@@ -1,4 +1,5 @@
 import user_type
+import numpy as np
 
 rows = 10
 cols = 20
@@ -29,3 +30,7 @@ test(mat)
 
 mat = user_type.create_float(rows,cols)
 test(mat)
+
+v = user_type.CustomDouble(1)
+a = np.array(v)
+assert type(v) == a.dtype.type