diff --git a/Lib/ctypes/test/test_cast.py b/Lib/ctypes/test/test_cast.py
index 7371b0f..cafb697 100644
--- a/Lib/ctypes/test/test_cast.py
+++ b/Lib/ctypes/test/test_cast.py
@@ -34,17 +34,17 @@
         array = (c_char_p * 5)()
         self.failUnlessEqual(array._objects, None)
         array[0] = "foo bar"
-        self.failUnlessEqual(array._objects, {'0': "foo bar"})
+        self.failUnlessEqual(array._objects, {'0': b"foo bar"})
 
         p = cast(array, POINTER(c_char_p))
         # array and p share a common _objects attribute
         self.failUnless(p._objects is array._objects)
-        self.failUnlessEqual(array._objects, {'0': "foo bar", id(array): array})
+        self.failUnlessEqual(array._objects, {'0': b"foo bar", id(array): array})
         p[0] = "spam spam"
-        self.failUnlessEqual(p._objects, {'0': "spam spam", id(array): array})
+        self.failUnlessEqual(p._objects, {'0': b"spam spam", id(array): array})
         self.failUnless(array._objects is p._objects)
         p[1] = "foo bar"
-        self.failUnlessEqual(p._objects, {'1': 'foo bar', '0': "spam spam", id(array): array})
+        self.failUnlessEqual(p._objects, {'1': b'foo bar', '0': b"spam spam", id(array): array})
         self.failUnless(array._objects is p._objects)
 
     def test_other(self):
diff --git a/Lib/ctypes/test/test_internals.py b/Lib/ctypes/test/test_internals.py
index 04b2040..509d2c4 100644
--- a/Lib/ctypes/test/test_internals.py
+++ b/Lib/ctypes/test/test_internals.py
@@ -76,11 +76,11 @@
         x = X()
         x.a = s1
         x.b = s2
-        self.failUnlessEqual(x._objects, {"0": s1, "1": s2})
+        self.failUnlessEqual(x._objects, {"0": bytes(s1), "1": bytes(s2)})
 
         y = Y()
         y.x = x
-        self.failUnlessEqual(y._objects, {"0": {"0": s1, "1": s2}})
+        self.failUnlessEqual(y._objects, {"0": {"0": bytes(s1), "1": bytes(s2)}})
 ##        x = y.x
 ##        del y
 ##        print x._b_base_._objects