diff --git a/Lib/test/test_tcl.py b/Lib/test/test_tcl.py
index f6750328f4f..6fd2d07777c 100644
--- a/Lib/test/test_tcl.py
+++ b/Lib/test/test_tcl.py
@@ -143,7 +143,9 @@ def test_getint(self):
         tcl = self.interp.tk
         for i in self.get_integers():
             self.assertEqual(tcl.getint(' %d ' % i), i)
-            self.assertEqual(tcl.getint(' %#o ' % i), i)
+            if tcl_version >= (8, 5):
+                self.assertEqual(tcl.getint(' %#o ' % i), i)
+            self.assertEqual(tcl.getint((' %#o ' % i).replace('o', '')), i)
             self.assertEqual(tcl.getint(' %#x ' % i), i)
         if tcl_version < (8, 5):  # bignum was added in Tcl 8.5
             self.assertRaises(TclError, tcl.getint, str(2**1000))
@@ -420,9 +422,7 @@ def test_expr_bignum(self):
                 self.assertEqual(result, str(i))
                 self.assertIsInstance(result, str)
         if tcl_version < (8, 5):  # bignum was added in Tcl 8.5
-            result = tcl.call('expr', str(2**1000))
-            self.assertEqual(result, str(2**1000))
-            self.assertIsInstance(result, str)
+            self.assertRaises(TclError, tcl.call, 'expr', str(2**1000))
 
     def test_passing_values(self):
         def passValue(value):