diff --git a/pgpy/packet/packets.py b/pgpy/packet/packets.py
index cd494137..1dae50df 100644
--- a/pgpy/packet/packets.py
+++ b/pgpy/packet/packets.py
@@ -718,7 +718,7 @@ def __bytearray__(self):
         _bytes += bytearray([self.halg])
         _bytes += bytearray([self.pubalg])
         _bytes += binascii.unhexlify(self.signer.encode("latin-1"))
-        _bytes += bytearray([int(self.nested)])
+        _bytes += bytearray([int(not self.nested)])
         return _bytes
 
     def parse(self, packet):
@@ -735,7 +735,7 @@ def parse(self, packet):
         self.signer = packet[:8]
         del packet[:8]
 
-        self.nested = (packet[0] == 1)
+        self.nested = (packet[0] == 0)
         del packet[0]
 
 
diff --git a/pgpy/pgp.py b/pgpy/pgp.py
index f34a25fb..b3e47a11 100644
--- a/pgpy/pgp.py
+++ b/pgpy/pgp.py
@@ -1018,7 +1018,7 @@ def __iter__(self):
             ##TODO: is it worth coming up with a way of disabling one-pass signing?
             for sig in reversed(self._signatures):
                 ops = sig.make_onepass()
-                if sig is not self._signatures[-1]:
+                if sig is not self._signatures[0]:
                     ops.nested = True
                 yield ops