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-rw-r--r--slirp/cksum.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/slirp/cksum.c b/slirp/cksum.c
index 34977ffc03..a044ec17cc 100644
--- a/slirp/cksum.c
+++ b/slirp/cksum.c
@@ -68,7 +68,9 @@ int cksum(struct mbuf *m, int len)
if (len < mlen)
mlen = len;
+#ifdef DEBUG
len -= mlen;
+#endif
/*
* Force to even boundary.
*/