--- a/mercurial/lsprof.py	Sun Oct 06 19:25:18 2019 -0400
+++ b/mercurial/lsprof.py	Mon Oct 07 00:04:04 2019 -0400
@@ -4,6 +4,7 @@
 import sys
 
 from .pycompat import getattr
+from . import pycompat
 
 Profiler = _lsprof.Profiler
 
@@ -125,7 +126,7 @@
     try:
         mname = _fn2mod[code.co_filename]
     except KeyError:
-        for k, v in list(sys.modules.iteritems()):
+        for k, v in list(pycompat.iteritems(sys.modules)):
             if v is None:
                 continue
             if not isinstance(getattr(v, '__file__', None), str):