diff --git a/deepxde/geometry/geometry.py b/deepxde/geometry/geometry.py
index 554637ea9..c224f1e77 100644
--- a/deepxde/geometry/geometry.py
+++ b/deepxde/geometry/geometry.py
@@ -6,8 +6,6 @@
 
 import numpy as np
 
-from . import csg
-
 
 class Geometry(object):
     def __init__(self, dim, bbox, diam):
@@ -86,24 +84,36 @@ def background_points(self, x, dirn, dist2npt, shift):
 
     def union(self, other):
         """CSG Union."""
+        from . import csg
+
         return csg.CSGUnion(self, other)
 
     def __or__(self, other):
         """CSG Union."""
+        from . import csg
+
         return csg.CSGUnion(self, other)
 
     def difference(self, other):
         """CSG Difference."""
+        from . import csg
+
         return csg.CSGDifference(self, other)
 
     def __sub__(self, other):
         """CSG Difference."""
+        from . import csg
+
         return csg.CSGDifference(self, other)
 
     def intersection(self, other):
         """CSG Intersection."""
+        from . import csg
+
         return csg.CSGIntersection(self, other)
 
     def __and__(self, other):
         """CSG Intersection."""
+        from . import csg
+
         return csg.CSGIntersection(self, other)