diff --git a/scrapy/settings/default_settings.py b/scrapy/settings/default_settings.py
index 8435b0354..b151933b6 100644
--- a/scrapy/settings/default_settings.py
+++ b/scrapy/settings/default_settings.py
@@ -18,6 +18,8 @@ import sys
 from importlib import import_module
 from os.path import join, abspath, dirname
 
+import six
+
 AJAXCRAWL_ENABLED = False
 
 AUTOTHROTTLE_ENABLED = False
@@ -163,7 +165,7 @@ HTTPCACHE_ALWAYS_STORE = False
 HTTPCACHE_IGNORE_HTTP_CODES = []
 HTTPCACHE_IGNORE_SCHEMES = ['file']
 HTTPCACHE_IGNORE_RESPONSE_CACHE_CONTROLS = []
-HTTPCACHE_DBM_MODULE = 'anydbm'
+HTTPCACHE_DBM_MODULE = 'anydbm' if six.PY2 else 'dbm'
 HTTPCACHE_POLICY = 'scrapy.extensions.httpcache.DummyPolicy'
 HTTPCACHE_GZIP = False
 
diff --git a/tox.ini b/tox.ini
index eae7e8e47..874a22ee2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -42,6 +42,7 @@ deps =
     -rrequirements-py3.txt
     # Extras
     Pillow
+    leveldb
     -rtests/requirements-py3.txt
 
 [testenv:py34]