diff --git a/construct/protocols/layer3/ipv6.py b/construct/protocols/layer3/ipv6.py
index 18a0955..fde16ba 100644
--- a/construct/protocols/layer3/ipv6.py
+++ b/construct/protocols/layer3/ipv6.py
@@ -2,7 +2,7 @@
 Internet Protocol version 6 (TCP/IP protocol stack)
 """
 from construct import *
-from ipv4 import ProtocolEnum
+from .ipv4 import ProtocolEnum
 from binascii import unhexlify
 import six