Don't overwrite the error raised by the callback.
diff --git a/OpenSSL/test/test_crypto.py b/OpenSSL/test/test_crypto.py
index 56638e8..4438f8c 100644
--- a/OpenSSL/test/test_crypto.py
+++ b/OpenSSL/test/test_crypto.py
@@ -1990,6 +1990,18 @@
         self.assertTrue(isinstance(key, PKeyType))
 
 
+    def test_load_privatekey_passphrase_exception(self):
+        """
+        If the passphrase callback raises an exception, that exception is raised
+        by :py:obj:`load_privatekey`.
+        """
+        def cb(ignored):
+            raise ArithmeticError
+
+        self.assertRaises(ArithmeticError,
+            load_privatekey, FILETYPE_PEM, encryptedPrivateKeyPEM, cb)
+
+
     def test_load_privatekey_wrongPassphraseCallback(self):
         """
         :py:obj:`load_privatekey` raises :py:obj:`OpenSSL.crypto.Error` when it is passed an
@@ -2021,22 +2033,6 @@
         self.assertEqual(called, [False])
 
 
-    def test_load_privatekey_passphrase_exception(self):
-        """
-        An exception raised by the passphrase callback passed to
-        :py:obj:`load_privatekey` causes :py:obj:`OpenSSL.crypto.Error` to be raised.
-
-        This isn't as nice as just letting the exception pass through.  The
-        behavior might be changed to that eventually.
-        """
-        def broken(ignored):
-            raise RuntimeError("This is not working.")
-        self.assertRaises(
-            Error,
-            load_privatekey,
-            FILETYPE_PEM, encryptedPrivateKeyPEM, broken)
-
-
     def test_dump_privatekey_wrong_args(self):
         """
         :py:obj:`dump_privatekey` raises :py:obj:`TypeError` if called with the wrong number
@@ -2171,6 +2167,19 @@
         self.assertEqual(loadedKey.bits(), key.bits())
 
 
+    def test_dump_privatekey_passphrase_exception(self):
+        """
+        L{dump_privatekey} should not overwrite the exception raised
+        by the passphrase callback.
+        """
+        def cb(ignored):
+            raise ArithmeticError
+
+        key = load_privatekey(FILETYPE_PEM, cleartextPrivateKeyPEM)
+        self.assertRaises(ArithmeticError,
+            dump_privatekey, FILETYPE_PEM, key, "blowfish", cb)
+
+
     def test_load_pkcs7_data(self):
         """
         :py:obj:`load_pkcs7_data` accepts a PKCS#7 string and returns an instance of