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-rw-r--r--src/vnet/ip/ip_packet.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/vnet/ip/ip_packet.h b/src/vnet/ip/ip_packet.h
index c160deefbeb..b0b5f41260c 100644
--- a/src/vnet/ip/ip_packet.h
+++ b/src/vnet/ip/ip_packet.h
@@ -211,7 +211,7 @@ ip_csum (void *data, u16 n_left)
sum8 = u32x8_hadd (sum8, zero);
sum4 = u32x8_extract_lo (sum8) + u32x8_extract_hi (sum8);
- sum = sum4[0] + sum4[1];
+ sum += sum4[0] + sum4[1];
#else
/* scalar version */