diff --git a/eventlet/proc.py b/eventlet/proc.py
index ddc7dc7..6b65bc0 100644
--- a/eventlet/proc.py
+++ b/eventlet/proc.py
@@ -1,3 +1,4 @@
+import warnings
 warnings.warn("The proc module is deprecated!  Please use the greenthread " 
               "module, or any of the many other Eventlet cross-coroutine "
               "primitives, instead.",