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-rw-r--r--ryu/lib/packet/packet_utils.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/ryu/lib/packet/packet_utils.py b/ryu/lib/packet/packet_utils.py
index c36be490..0052335a 100644
--- a/ryu/lib/packet/packet_utils.py
+++ b/ryu/lib/packet/packet_utils.py
@@ -35,7 +35,7 @@ def checksum(data):
# avoid circular import
-_IPV4_PSEUDO_HEADER_PACK_STR = '!IIxBH'
+_IPV4_PSEUDO_HEADER_PACK_STR = '!4s4sxBH'
_IPV6_PSEUDO_HEADER_PACK_STR = '!16s16sI3xB'