diff --git a/masque/shapes/arc.py b/masque/shapes/arc.py
index c47840a..92204a4 100644
--- a/masque/shapes/arc.py
+++ b/masque/shapes/arc.py
@@ -1,4 +1,5 @@
 from typing import List, Tuple, Dict
+import copy
 import math
 import numpy
 from numpy import pi
diff --git a/masque/shapes/circle.py b/masque/shapes/circle.py
index c706856..5ee901f 100644
--- a/masque/shapes/circle.py
+++ b/masque/shapes/circle.py
@@ -1,4 +1,5 @@
 from typing import List, Dict
+import copy
 import numpy
 from numpy import pi
 
diff --git a/masque/shapes/ellipse.py b/masque/shapes/ellipse.py
index 498d281..fba194a 100644
--- a/masque/shapes/ellipse.py
+++ b/masque/shapes/ellipse.py
@@ -1,4 +1,5 @@
 from typing import List, Tuple, Dict
+import copy
 import math
 import numpy
 from numpy import pi