1 files changed, 2 insertions, 2 deletions
diff --git a/print-ip.c b/print-ip.c
index 22bd8005..3c7f107f 100644
--- a/print-ip.c
+++ b/print-ip.c
@@ -131,7 +131,7 @@ trunc:
  */
 int
 nextproto4_cksum(const struct ip *ip, const u_int8_t *data,
-		 u_int len, u_int next_proto)
+		 u_int len, u_int covlen, u_int next_proto)
 {
 	struct phdr {
 		u_int32_t src;
@@ -155,7 +155,7 @@ nextproto4_cksum(const struct ip *ip, const u_int8_t *data,
 	vec[0].ptr = (const u_int8_t *)(void *)&ph;
 	vec[0].len = sizeof(ph);
 	vec[1].ptr = data;
-	vec[1].len = len;
+	vec[1].len = covlen;
 	return (in_cksum(vec, 2));
 }