diff --git a/requests/_oauth.py b/requests/_oauth.py
index 165e937e..055154d0 100644
--- a/requests/_oauth.py
+++ b/requests/_oauth.py
@@ -16,9 +16,8 @@ try:
     from oauthlib.common import extract_params
     from oauthlib.oauth1.rfc5849 import (Client, SIGNATURE_HMAC, SIGNATURE_TYPE_AUTH_HEADER)
 except ImportError:
-    directory = os.path.dirname(__file__)
-    path = os.path.join(directory, 'packages')
-    sys.path.insert(0, path)
+    from .packages import oauthlib
+    sys.modules['oauthlib'] = oauthlib
     from oauthlib.oauth1 import rfc5849
     from oauthlib.common import extract_params
     from oauthlib.oauth1.rfc5849 import (Client, SIGNATURE_HMAC, SIGNATURE_TYPE_AUTH_HEADER)