diff --git a/acme/setup.py b/acme/setup.py
index e35b40d6e..e75d77efd 100644
--- a/acme/setup.py
+++ b/acme/setup.py
@@ -10,8 +10,6 @@ install_requires = [
     # load_pem_private/public_key (>=0.6)
     # rsa_recover_prime_factors (>=0.8)
     'cryptography>=0.8',
-    'ndg-httpsclient',  # urllib3 InsecurePlatformWarning (#304)
-    'pyasn1',  # urllib3 InsecurePlatformWarning (#304)
     # Connection.set_tlsext_host_name (>=0.13), X509Req.get_extensions (>=0.15)
     'PyOpenSSL>=0.15',
     'pyrfc3339',
@@ -29,6 +27,10 @@ if sys.version_info < (2, 7):
         'argparse',
         'mock<1.1.0',
     ])
+elif sys.version_info < (2, 7, 9):
+    # For secure SSL connexion with Python 2.7 (InsecurePlatformWarning)
+    install_requires.append('ndg-httpsclient')
+    install_requires.append('pyasn1')
 else:
     install_requires.append('mock')
 
diff --git a/setup.py b/setup.py
index e94891802..0341e400b 100644
--- a/setup.py
+++ b/setup.py
@@ -55,7 +55,7 @@ if sys.version_info < (2, 7):
         'argparse',
         'mock<1.1.0',
     ])
-elif sys.version_info < (2, 8):
+elif sys.version_info < (2, 7, 9):
     # For secure SSL connexion with Python 2.7 (InsecurePlatformWarning)
     install_requires.append('ndg-httpsclient')
     install_requires.append('pyasn1')