diff --git a/cryptography/bindings/openssl/api.py b/cryptography/bindings/openssl/api.py
index 65a29b8..d9181d7 100644
--- a/cryptography/bindings/openssl/api.py
+++ b/cryptography/bindings/openssl/api.py
@@ -11,6 +11,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from __future__ import absolute_import, division, print_function
+
 import cffi
 
 
diff --git a/cryptography/primitives/block/__init__.py b/cryptography/primitives/block/__init__.py
index e49fcf3..a0c6d03 100644
--- a/cryptography/primitives/block/__init__.py
+++ b/cryptography/primitives/block/__init__.py
@@ -1,3 +1,18 @@
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import absolute_import, division, print_function
+
 from cryptography.primitives.block.base import BlockCipher
 
 
diff --git a/cryptography/primitives/block/base.py b/cryptography/primitives/block/base.py
index 2018138..f4a04b3 100644
--- a/cryptography/primitives/block/base.py
+++ b/cryptography/primitives/block/base.py
@@ -11,6 +11,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from __future__ import absolute_import, division, print_function
+
 # TODO: which binding is used should be an option somewhere
 from enum import Enum
 
diff --git a/cryptography/primitives/block/ciphers.py b/cryptography/primitives/block/ciphers.py
index 3d76afa..2e47870 100644
--- a/cryptography/primitives/block/ciphers.py
+++ b/cryptography/primitives/block/ciphers.py
@@ -11,6 +11,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from __future__ import absolute_import, division, print_function
+
 
 class AES(object):
     name = "AES"
diff --git a/cryptography/primitives/block/modes.py b/cryptography/primitives/block/modes.py
index 02f0219..de31f08 100644
--- a/cryptography/primitives/block/modes.py
+++ b/cryptography/primitives/block/modes.py
@@ -11,6 +11,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from __future__ import absolute_import, division, print_function
+
 
 class CBC(object):
     name = "CBC"
diff --git a/tests/primitives/test_block.py b/tests/primitives/test_block.py
index 0407b0f..774409c 100644
--- a/tests/primitives/test_block.py
+++ b/tests/primitives/test_block.py
@@ -11,6 +11,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from __future__ import absolute_import, division, print_function
+
 import binascii
 
 import pretend
diff --git a/tests/primitives/test_ciphers.py b/tests/primitives/test_ciphers.py
index 891c5cf..5ee9f22 100644
--- a/tests/primitives/test_ciphers.py
+++ b/tests/primitives/test_ciphers.py
@@ -11,6 +11,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from __future__ import absolute_import, division, print_function
+
 import binascii
 
 import pytest
diff --git a/tests/primitives/test_nist.py b/tests/primitives/test_nist.py
index dc26543..db5e034 100644
--- a/tests/primitives/test_nist.py
+++ b/tests/primitives/test_nist.py
@@ -14,6 +14,9 @@
 """
 Test using the NIST Test Vectors
 """
+
+from __future__ import absolute_import, division, print_function
+
 import binascii
 import os