diff --git a/ait/core/tlm.py b/ait/core/tlm.py
index 45e0fa74..ac0bb67c 100644
--- a/ait/core/tlm.py
+++ b/ait/core/tlm.py
@@ -196,7 +196,7 @@ def log(msg):
                 flds = (self.name, str(value))
                 log("%s value '%s' not in allowed enumerated values." % flds)
             else:
-                primitive = int(self.enum.keys()[self.enum.values().index(value)])
+                primitive = int(list(self.enum.keys())[list(self.enum.values().index(value))])
 
         if self.type:
             if self.type.validate(primitive, messages, self.name) is False:
@@ -384,7 +384,7 @@ def log(msg):
                 flds = (self.name, str(value))
                 log("%s value '%s' not in allowed enumerated values." % flds)
             else:
-                primitive = int(self.enum.keys()[self.enum.values().index(value)])
+                primitive = int(list(self.enum.keys())[list(self.enum.values().index(value))])
 
         if self.type:
             if self.type.validate(primitive, messages, self.name) is False: