Need to include the imports
diff --git a/docs/hazmat/primitives/symmetric-encryption.rst b/docs/hazmat/primitives/symmetric-encryption.rst
index f3def84..55b2dcd 100644
--- a/docs/hazmat/primitives/symmetric-encryption.rst
+++ b/docs/hazmat/primitives/symmetric-encryption.rst
@@ -269,6 +269,7 @@
.. doctest::
>>> import os
+ >>> from cryptography.hazmat.primitives.ciphers.modes import CBC
>>> iv = os.urandom(16)
>>> mode = CBC(iv)
@@ -276,6 +277,7 @@
.. doctest::
+ >>> from cryptography.hazmat.primitives.ciphers.modes import CBC
>>> iv = "a" * 16
>>> mode = CBC(iv)