diff --git a/requirements.txt b/requirements.txt
index 005b8f4f5..a6f38bf4e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,3 +5,4 @@ cssselect>=0.9
 w3lib>=1.8.0
 queuelib
 six>=1.5.2
+service_identity
diff --git a/setup.py b/setup.py
index bacdca358..0e99e7933 100644
--- a/setup.py
+++ b/setup.py
@@ -44,5 +44,6 @@ setup(
         'pyOpenSSL',
         'cssselect>=0.9',
         'six>=1.5.2',
+        'service_identity',
     ],
 )
diff --git a/tox.ini b/tox.ini
index 5c8c8c78d..ef2ff345d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,7 +13,6 @@ deps =
     boto
     Pillow
     leveldb
-    service_identity
     -rtests/requirements.txt
 commands =
     py.test {posargs:scrapy tests}
@@ -47,7 +46,6 @@ deps =
     queuelib>=1.1.1
     w3lib>=1.8.0
     Pillow
-    service_identity
     # tests requirements
     pytest>=2.6.0
     pytest-twisted