diff --git a/scripts/lib/CIME/case.py b/scripts/lib/CIME/case.py
index 67fdd40cdd7..f3162c1865b 100644
--- a/scripts/lib/CIME/case.py
+++ b/scripts/lib/CIME/case.py
@@ -7,7 +7,7 @@
 from copy import deepcopy
 import glob, os, shutil, math
 from CIME.XML.standard_module_setup import *
-
+from CIME.six.moves import input
 from CIME.utils                     import expect, get_cime_root, append_status
 from CIME.utils                     import convert_to_type, get_model, get_project
 from CIME.utils                     import get_current_commit, check_name
diff --git a/scripts/lib/CIME/utils.py b/scripts/lib/CIME/utils.py
index 4b09cd197ce..5dc1d2f4180 100644
--- a/scripts/lib/CIME/utils.py
+++ b/scripts/lib/CIME/utils.py
@@ -5,6 +5,7 @@
 import logging, gzip, sys, os, time, re, shutil, glob, string, random, imp, errno, signal
 import stat as statlib
 import warnings
+from CIME import six
 from contextlib import contextmanager
 
 # Return this error code if the scripts worked but tests failed
@@ -856,9 +857,9 @@ def convert_to_string(value, type_str=None, vid=""):
     """
     if value is not None and type(value) is not str:
         if type_str == "char":
-            expect(type(value) is str, "Wrong type for entry id '{}'".format(vid))
+            expect(isinstance(value, six.string_types), "Wrong type for entry id '{}'".format(vid))
         elif type_str == "integer":
-            expect(type(value) is int, "Wrong type for entry id '{}'".format(vid))
+            expect(isinstance(value, six.integer_types), "Wrong type for entry id '{}'".format(vid))
             value = str(value)
         elif type_str == "logical":
             expect(type(value) is bool, "Wrong type for entry id '{}'".format(vid))