diff --git a/testdata/python/dbPCells.py b/testdata/python/dbPCells.py
index 14ca10e5e..e51c648fd 100644
--- a/testdata/python/dbPCells.py
+++ b/testdata/python/dbPCells.py
@@ -166,7 +166,8 @@ class DBPCellTests(unittest.TestCase):
   def test_0(self):
 
     # PCellDeclarationHelper is inside "pya.__all__"
-    self.assertEqual("PCellDeclarationHelper" in pya.__all__, True)
+    if hasattr(pya, "__all__"):
+      self.assertEqual("PCellDeclarationHelper" in pya.__all__, True)
 
   def test_1(self):