diff --git a/ObservationSim/MockObject/__init__.py b/ObservationSim/MockObject/__init__.py
index 63734c6e4faef8672477eeca8f3d64b03c9aa207..83febe24fd292052aef8242970e4616db7da7514 100755
--- a/ObservationSim/MockObject/__init__.py
+++ b/ObservationSim/MockObject/__init__.py
@@ -3,5 +3,6 @@ from .Galaxy import Galaxy
 from .CatalogBase import CatalogBase
 from .Quasar import Quasar
 from .Star import Star
+from .Stamp import Stamp
 from .SkybackgroundMap import *
-# from .CosmicRay import CosmicRay
\ No newline at end of file
+# from .CosmicRay import CosmicRay