diff --git a/dev-requirements.txt b/dev-requirements.txt
index 9dabba1..9a3a5fb 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -3,6 +3,7 @@
 invoke
 iso8601
 pep8-naming
+flake8-import-order
 pretend
 pytest
 requests
diff --git a/tox.ini b/tox.ini
index 78b8b4c..680f454 100644
--- a/tox.ini
+++ b/tox.ini
@@ -43,6 +43,7 @@
 deps =
     flake8
     pep8-naming
+    flake8-import-order
 commands = flake8 .
 
 [testenv:py3pep8]
@@ -50,8 +51,10 @@
 deps =
     flake8
     pep8-naming
+    flake8-import-order
 commands = flake8 .
 
 [flake8]
 exclude = .tox,*.egg
-select = E,W,F,N
+select = E,W,F,N,I
+application-import-names = cryptography,tests