diff --git a/usr.bin/kdump/kdump.c b/usr.bin/kdump/kdump.c
index ba09170d8f69..9ee5827383a6 100644
--- a/usr.bin/kdump/kdump.c
+++ b/usr.bin/kdump/kdump.c
@@ -1014,6 +1014,15 @@ ktrsyscall(struct ktr_syscall *ktr, u_int flags)
 				}
 				capname(arg);
 				break;
+			case SYS_posix_fadvise:
+				print_number(ip,narg,c);
+				print_number(ip,narg,c);
+				print_number(ip,narg,c);
+				(void)putchar(',');
+				fadvisebehavname((int)*ip);
+				ip++;
+				narg--;
+				break;
 			}
 		}
 		while (narg > 0) {
diff --git a/usr.bin/kdump/mksubr b/usr.bin/kdump/mksubr
index 75846ee81a23..99dd80f80786 100644
--- a/usr.bin/kdump/mksubr
+++ b/usr.bin/kdump/mksubr
@@ -340,6 +340,7 @@ auto_or_type     "accessmodename"      "[A-Z]_OK[[:space:]]+0?x?[0-9A-Fa-f]+"
 auto_switch_type "acltypename"         "ACL_TYPE_[A-Z4_]+[[:space:]]+0x[0-9]+"        "sys/acl.h"
 auto_or_type     "capname"             "CAP_[A-Z]+[[:space:]]+0x[01248]{16}ULL"       "sys/capability.h"
 auto_switch_type "extattrctlname"      "EXTATTR_NAMESPACE_[A-Z]+[[:space:]]+0x[0-9]+" "sys/extattr.h"
+auto_switch_type "fadvisebehavname"    "POSIX_FADV_[A-Z]+[[:space:]]+[0-9]+"          "sys/fcntl.h"
 auto_or_type     "flagsname"           "O_[A-Z]+[[:space:]]+0x[0-9A-Fa-f]+"           "sys/fcntl.h"
 auto_or_type     "flockname"           "LOCK_[A-Z]+[[:space:]]+0x[0-9]+"              "sys/fcntl.h"
 auto_or_type     "getfsstatflagsname"  "MNT_[A-Z]+[[:space:]]+[1-9][0-9]*"            "sys/mount.h"