diff --git a/yabgp/message/attribute/nlri/ipv6_unicast.py b/yabgp/message/attribute/nlri/ipv6_unicast.py
index f625c03..77080c3 100644
--- a/yabgp/message/attribute/nlri/ipv6_unicast.py
+++ b/yabgp/message/attribute/nlri/ipv6_unicast.py
@@ -42,8 +42,12 @@ def parse(cls, nlri_data):
             else:
                 prefix_byte_len = prefix_bit_len / 8 + 1
             offset = int(prefix_byte_len + 1)
-            prefix_addr = str(netaddr.IPAddress(int(binascii.b2a_hex(nlri_data[1:offset]), 16))) \
-                + '/%s' % prefix_bit_len
+            if len(nlri_data[1:offset]) < 16:
+                prefix_addr = str(netaddr.IPAddress(int(binascii.b2a_hex(nlri_data[1:offset]+b'\x00'*(16-len(nlri_data[1:offset]))), 16))) \
+                              + '/%s' % prefix_bit_len
+            else:
+                prefix_addr = str(netaddr.IPAddress(int(binascii.b2a_hex(nlri_data[1:offset]), 16))) \
+                                + '/%s' % prefix_bit_len
             nlri_list.append(prefix_addr)
             nlri_data = nlri_data[int(prefix_byte_len) + 1:]