diff --git a/mercurial/keepalive.py b/mercurial/keepalive.py
--- a/mercurial/keepalive.py
+++ b/mercurial/keepalive.py
@@ -193,7 +193,7 @@
 
     def close_all(self):
         """close all open connections"""
-        for host, conns in pycompat.iteritems(self._cm.get_all()):
+        for host, conns in self._cm.get_all().items():
             for h in conns:
                 self._cm.remove(h)
                 h.close()