diff --git a/setup.py b/setup.py
index bfce6d4f3..d6d9cf673 100644
--- a/setup.py
+++ b/setup.py
@@ -54,14 +54,6 @@ if root_dir != '':
     os.chdir(root_dir)
 scrapy_dir = 'scrapy'
 
-# Generate dropin.cache for spiders under tests
-# if dropin.cache is missing, running tests under python site-packages fails with permission errors
-import os
-os.environ['SCRAPY_SETTINGS_DISABLED']='1'
-from twisted.plugin import getPlugins, IPlugin
-import scrapy.tests.test_spiders
-list(getPlugins(IPlugin, scrapy.tests.test_spiders))
-
 def is_not_module(filename):
     return os.path.splitext(f)[1] not in ['.py', '.pyc', '.pyo']