diff --git a/tests/unit/requirements.txt b/tests/unit/requirements.txt
index 054a9cf5..cf3ec91c 100644
--- a/tests/unit/requirements.txt
+++ b/tests/unit/requirements.txt
@@ -1,5 +1,5 @@
 cryptography
-ipaddress
+ipaddress ; python_version < '3.0'
 pyopenssl
 
 unittest2 ; python_version < '2.7'