diff --git a/openerp/tools/lru.py b/openerp/tools/lru.py
index 095f5cf48ce..c9de62130ce 100644
--- a/openerp/tools/lru.py
+++ b/openerp/tools/lru.py
@@ -123,7 +123,7 @@ class LRU(object):
     def clear_prefix(self, prefix):
         """ Remove from `self` all the items with the given `prefix`. """
         n = len(prefix)
-        for key in self.iterkeys():
+        for key in self.keys():
             if key[:n] == prefix:
                 del self[key]