diff --git a/starfish/__init__.py b/starfish/__init__.py
index 83b33bef6..0b084dfdc 100644
--- a/starfish/__init__.py
+++ b/starfish/__init__.py
@@ -18,4 +18,5 @@
 from .core.expression_matrix.expression_matrix import ExpressionMatrix
 from .core.imagestack.imagestack import ImageStack
 from .core.intensity_table.intensity_table import IntensityTable
+from .core.segmentation_mask import SegmentationMaskCollection
 from .core.starfish import starfish