diff -r 51724e5b2bd9 -r 343b002e5626 virtualenv/res/lib/lib_create_env.py
--- a/virtualenv/res/lib/lib_create_env.py	Wed Oct 28 11:17:49 2015 +0100
+++ b/virtualenv/res/lib/lib_create_env.py	Mon Apr 04 17:04:14 2016 +0200
@@ -283,10 +283,10 @@
             if res_source_key == 'local':
                 if extra_env is None:
                     extra_env = {}
-                extra_env["PIP_DOWNLOAD_CACHE"] = res_env.get_src_base_path("")
                 args.insert(2, '-f')
                 args.insert(3, res_env.get_src_base_path(""))
                 args.insert(4, '--no-index')
+                args.insert(5, '--no-cache-dir')
             logger.notify("Install %s from %s with %s args %s " % (key,res_path,method, repr(args)))
             call_subprocess(args,
                     cwd=os.path.abspath(tmp_dir),
@@ -303,10 +303,10 @@
             if res_source_key == 'local':
                 if extra_env is None:
                     extra_env = {}
-                extra_env["PIP_DOWNLOAD_CACHE"] = res_env.get_src_base_path("")
                 args.insert(2, '-f')
                 args.insert(3, res_env.get_src_base_path(""))
                 args.insert(4, '--no-index')
+                args.insert(5, '--no-cache-dir')
             logger.notify("Install %s from %s with %s args %s " % (key,res_path,method, repr(args)))
             call_subprocess(args,
                     cwd=os.path.abspath(tmp_dir),