--- dpkt/bgp.py
+++ dpkt/bgp.py
@@ -140,7 +140,7 @@
     class Open(dpkt.Packet):
         __hdr__ = (
             ('v', 'B', 4),
-            ('as', 'H', 0),
+            ('as_', 'H', 0),
             ('holdtime', 'H', 0),
             ('identifier', 'I', 0),
             ('param_len', 'B', 0)
@@ -401,7 +401,7 @@
 
             class Aggregator(dpkt.Packet):
                 __hdr__ = (
-                    ('as', 'H', 0),
+                    ('as_', 'H', 0),
                     ('ip', 'I', 0)
                 )
 
@@ -428,7 +428,7 @@
 
                 class Community(dpkt.Packet):
                     __hdr__ = (
-                        ('as', 'H', 0),
+                        ('as_', 'H', 0),
                         ('value', 'H', 0)
                     )
 
@@ -675,7 +675,7 @@
             self.failUnless(a.len == 12)
             self.failUnless(len(a.communities.list) == 3)
             c = a.communities.list[0]
-            self.failUnless(c.as == 65215)
+            self.failUnless(c.as_ == 65215)
             self.failUnless(c.value == 1)
             r = b2.update.announced[0]
             self.failUnless(r.len == 22)
@@ -712,7 +712,7 @@
             b4 = BGP(self.bgp4)
             self.failUnless(b4.len == 45)
             self.failUnless(b4.type == OPEN)
-            self.failUnless(b4.open.as == 237)
+            self.failUnless(b4.open.as_ == 237)
             self.failUnless(b4.open.param_len == 16)
             self.failUnless(len(b4.open.parameters) == 3)
             p = b4.open.parameters[0]