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-rw-r--r--MdeModulePkg/Include/Library/NetLib.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/MdeModulePkg/Include/Library/NetLib.h b/MdeModulePkg/Include/Library/NetLib.h
index f1c6595a0d..875af7b283 100644
--- a/MdeModulePkg/Include/Library/NetLib.h
+++ b/MdeModulePkg/Include/Library/NetLib.h
@@ -61,6 +61,8 @@ typedef UINT16 TCP_PORTNO;
#define IP_VERSION_4 4
#define IP_VERSION_6 6
+#define IP6_PREFIX_LENGTH 64
+
#pragma pack(1)
//