diff --git a/gnupg/_parsers.py b/gnupg/_parsers.py
index 3dd4aad..bfae67e 100644
--- a/gnupg/_parsers.py
+++ b/gnupg/_parsers.py
@@ -1394,6 +1394,8 @@ class ListPackets(object):
         self.need_passphrase_sym = None
         #: The keyid and uid which this data is encrypted to.
         self.userid_hint = None
+        #: A list of keyid's that the message has been encrypted to.
+        self.key = []
 
     def _handle_status(self, key, value):
         """Parse a status code from the attached GnuPG process.
@@ -1403,9 +1405,8 @@ class ListPackets(object):
         if key == 'NODATA':
             self.status = nodata(value)
         elif key == 'ENC_TO':
-            # This will only capture keys in our keyring. In the future we
-            # may want to include multiple unknown keys in this list.
-            self.key, _, _ = value.split()
+            key_to_add, _, _ = value.split()
+            self.key.append(key_to_add)
         elif key == 'NEED_PASSPHRASE':
             self.need_passphrase = True
         elif key == 'NEED_PASSPHRASE_SYM':
diff --git a/gnupg/test/test_gnupg.py b/gnupg/test/test_gnupg.py
index fddf5d5..6cb7290 100755
--- a/gnupg/test/test_gnupg.py
+++ b/gnupg/test/test_gnupg.py
@@ -887,7 +887,7 @@ authentication."""
 
         self.assertEqual(message, decrypted)
 
-    def test_encryption_hidden_recipient(self):
+    def test_encryption_one_hidden_recipient_one_not(self):
         """Test to ensure hidden recipient isn't detailed in packet info"""
 
         alice = open(os.path.join(_files, 'test_key_1.pub'))
@@ -896,6 +896,13 @@ authentication."""
         res = alice_public.results[-1:][0]
         alice_pfpr = str(res['fingerprint'])
         alice.close()
+        
+        bob = open(os.path.join(_files, 'test_key_2.pub'))
+        bob_pub = bob.read()
+        bob_public = self.gpg.import_keys(bob_pub)
+        res = bob_public.results[-1:][0]
+        bob_pfpr = str(res['fingerprint'])
+        bob.close()
 
         message = """
 In 2010 Riggio and Sicari presented a practical application of homomorphic
@@ -904,13 +911,16 @@ transparent multi-hop wireless backhauls that are able to perform statistical
 analysis of different kinds of data (temperature, humidity, etc.)  coming from
 a WSN while ensuring both end-to-end encryption and hop-by-hop
 authentication."""
-        enc = self.gpg.encrypt(message, alice_pfpr, hidden_recipients=[alice_pfpr])
+        enc = self.gpg.encrypt(message, alice_pfpr, bob_pfpr, hidden_recipients=[alice_pfpr])
         encrypted = str(enc)
         log.debug("keyid = %s"
                   % alice_pfpr)
 
         self.assertNotEquals(message, encrypted)
-        self.assertEquals("0000000000000000", self.gpg.list_packets(encrypted).key)
+        ## We expect Alice's key to be hidden (returned as zero's) and Bob's 
+        ## key to be there.
+        expected_values = ["0000000000000000", "E0ED97345F2973D6"]
+        self.assertEquals(expected_values, self.gpg.list_packets(encrypted).key)
 
     def test_encryption_decryption_multi_recipient(self):
         """Test decryption of an encrypted string for multiple users"""
@@ -1102,7 +1112,7 @@ suites = { 'parsers': set(['test_parsers_fix_unsafe',
                          'test_encryption_alt_encoding',
                          'test_encryption_multi_recipient',
                          'test_encryption_decryption_multi_recipient',
-                         'test_encryption_hidden_recipient',
+                         'test_encryption_one_hidden_recipient_one_not',
                          'test_decryption',
                          'test_symmetric_encryption_and_decryption',
                          'test_file_encryption_and_decryption',