diff --git a/sys/netinet/in_kdtrace.c b/sys/netinet/in_kdtrace.c
--- a/sys/netinet/in_kdtrace.c
+++ b/sys/netinet/in_kdtrace.c
@@ -111,7 +111,7 @@
 SDT_PROBE_DEFINE3_XLATE(tcp, , , debug__input,
     "struct tcpcb *", "tcpsinfo_t *" ,
     "struct tcphdr *", "tcpinfoh_t *",
-    "uint8_t *", "ipinfo_t *");
+    "struct mbuf *", "ipinfo_t *");
 
 SDT_PROBE_DEFINE3_XLATE(tcp, , , debug__output,
     "struct tcpcb *", "tcpsinfo_t *" ,