diff --git a/gunicorn/workers/geventlet.py b/gunicorn/workers/geventlet.py
index ffa2e2d1..d8aec15f 100644
--- a/gunicorn/workers/geventlet.py
+++ b/gunicorn/workers/geventlet.py
@@ -25,7 +25,8 @@ class EventletWorker(AsyncWorker):
         import eventlet
         if eventlet.version_info < (0,9,7):
             raise RuntimeError("You need eventlet >= 0.9.7")
-        eventlet.monkey_patch(all=False, socket=True, select=True)
+        eventlet.monkey_patch(all=False, socket=True, select=True,
+                thread=True)
     
     def init_process(self):
         hubs.use_hub()