diff --git a/IPython/platutils.py b/IPython/platutils.py
index 561e68d..380652e 100644
--- a/IPython/platutils.py
+++ b/IPython/platutils.py
@@ -14,6 +14,7 @@ for your operation system, from platutils_PLATFORMNAME module.
 
 import os
 import sys
+import warnings
 
 # Import the platform-specific implementations
 if os.name == 'posix':