diff --git a/tools/python/jwutils/algo/ShuntingYard.py b/tools/python/jwutils/algo/ShuntingYard.py
index 07800ee..7368e9b 100644
--- a/tools/python/jwutils/algo/ShuntingYard.py
+++ b/tools/python/jwutils/algo/ShuntingYard.py
@@ -46,7 +46,7 @@ class ShuntingYard(object): # export
         #self.do_debug = True
         self.__ops = {}
         if operators is not None:
-            for k, v in operators.iteritems():
+            for k, v in operators.items():
                 self.add_operator(k, v.func, v.nargs, v.prec, v.assoc)
 
     def debug(self, *args):