diff --git a/unix/ztypes_openbsd_arm.go b/unix/ztypes_openbsd_arm.go
index 87a637e..510efc3 100644
--- a/unix/ztypes_openbsd_arm.go
+++ b/unix/ztypes_openbsd_arm.go
@@ -1,4 +1,4 @@
-// cgo -godefs types_openbsd.go | go run mkpost.go
+// cgo -godefs -- -fsigned-char types_openbsd.go | go run mkpost.go
 // Code generated by the command above; see README.md. DO NOT EDIT.
 
 // +build arm,openbsd
@@ -23,11 +23,13 @@
 type Timespec struct {
 	Sec  int64
 	Nsec int32
+	_    [4]byte
 }
 
 type Timeval struct {
 	Sec  int64
 	Usec int32
+	_    [4]byte
 }
 
 type Rusage struct {
@@ -57,28 +59,30 @@
 type _Gid_t uint32
 
 type Stat_t struct {
-	Mode           uint32
-	Dev            int32
-	Ino            uint64
-	Nlink          uint32
-	Uid            uint32
-	Gid            uint32
-	Rdev           int32
-	Atim           Timespec
-	Mtim           Timespec
-	Ctim           Timespec
-	Size           int64
-	Blocks         int64
-	Blksize        int32
-	Flags          uint32
-	Gen            uint32
-	X__st_birthtim Timespec
+	Mode    uint32
+	Dev     int32
+	Ino     uint64
+	Nlink   uint32
+	Uid     uint32
+	Gid     uint32
+	Rdev    int32
+	Atim    Timespec
+	Mtim    Timespec
+	Ctim    Timespec
+	Size    int64
+	Blocks  int64
+	Blksize int32
+	Flags   uint32
+	Gen     uint32
+	_       [4]byte
+	_       Timespec
 }
 
 type Statfs_t struct {
 	F_flags       uint32
 	F_bsize       uint32
 	F_iosize      uint32
+	_             [4]byte
 	F_blocks      uint64
 	F_bfree       uint64
 	F_bavail      int64
@@ -93,11 +97,11 @@
 	F_namemax     uint32
 	F_owner       uint32
 	F_ctime       uint64
-	F_fstypename  [16]uint8
-	F_mntonname   [90]uint8
-	F_mntfromname [90]uint8
-	F_mntfromspec [90]uint8
-	Pad_cgo_0     [2]byte
+	F_fstypename  [16]int8
+	F_mntonname   [90]int8
+	F_mntfromname [90]int8
+	F_mntfromspec [90]int8
+	_             [2]byte
 	Mount_info    [160]byte
 }
 
@@ -110,13 +114,13 @@
 }
 
 type Dirent struct {
-	Fileno       uint64
-	Off          int64
-	Reclen       uint16
-	Type         uint8
-	Namlen       uint8
-	X__d_padding [4]uint8
-	Name         [256]uint8
+	Fileno uint64
+	Off    int64
+	Reclen uint16
+	Type   uint8
+	Namlen uint8
+	_      [4]uint8
+	Name   [256]int8
 }
 
 type Fsid struct {
@@ -251,8 +255,10 @@
 	Filter int16
 	Flags  uint16
 	Fflags uint32
+	_      [4]byte
 	Data   int64
 	Udata  *byte
+	_      [4]byte
 }
 
 type FdSet struct {
@@ -260,8 +266,8 @@
 }
 
 const (
-	SizeofIfMsghdr         = 0x98
-	SizeofIfData           = 0x80
+	SizeofIfMsghdr         = 0xa8
+	SizeofIfData           = 0x90
 	SizeofIfaMsghdr        = 0x18
 	SizeofIfAnnounceMsghdr = 0x1a
 	SizeofRtMsghdr         = 0x60
@@ -290,7 +296,7 @@
 	Link_state   uint8
 	Mtu          uint32
 	Metric       uint32
-	Pad          uint32
+	Rdomain      uint32
 	Baudrate     uint64
 	Ipackets     uint64
 	Ierrors      uint64
@@ -302,8 +308,10 @@
 	Imcasts      uint64
 	Omcasts      uint64
 	Iqdrops      uint64
+	Oqdrops      uint64
 	Noproto      uint64
 	Capabilities uint32
+	_            [4]byte
 	Lastchange   Timeval
 }
 
@@ -328,7 +336,7 @@
 	Hdrlen  uint16
 	Index   uint16
 	What    uint16
-	Name    [16]uint8
+	Name    [16]int8
 }
 
 type RtMsghdr struct {
@@ -398,11 +406,11 @@
 }
 
 type BpfHdr struct {
-	Tstamp    BpfTimeval
-	Caplen    uint32
-	Datalen   uint32
-	Hdrlen    uint16
-	Pad_cgo_0 [2]byte
+	Tstamp  BpfTimeval
+	Caplen  uint32
+	Datalen uint32
+	Hdrlen  uint16
+	_       [2]byte
 }
 
 type BpfTimeval struct {
@@ -476,7 +484,7 @@
 	Zeropages          int32
 	Reserve_pagedaemon int32
 	Reserve_kernel     int32
-	Anonpages          int32
+	Unused01           int32
 	Vnodepages         int32
 	Vtextpages         int32
 	Freemin            int32
@@ -495,8 +503,8 @@
 	Swpgonly           int32
 	Nswget             int32
 	Nanon              int32
-	Nanonneeded        int32
-	Nfreeanon          int32
+	Unused05           int32
+	Unused06           int32
 	Faults             int32
 	Traps              int32
 	Intrs              int32
@@ -504,8 +512,8 @@
 	Softs              int32
 	Syscalls           int32
 	Pageins            int32
-	Obsolete_swapins   int32
-	Obsolete_swapouts  int32
+	Unused07           int32
+	Unused08           int32
 	Pgswapin           int32
 	Pgswapout          int32
 	Forks              int32
@@ -513,7 +521,7 @@
 	Forks_sharevm      int32
 	Pga_zerohit        int32
 	Pga_zeromiss       int32
-	Zeroaborts         int32
+	Unused09           int32
 	Fltnoram           int32
 	Fltnoanon          int32
 	Fltnoamap          int32
@@ -545,9 +553,9 @@
 	Pdpageouts         int32
 	Pdpending          int32
 	Pddeact            int32
-	Pdreanon           int32
-	Pdrevnode          int32
-	Pdrevtext          int32
+	Unused11           int32
+	Unused12           int32
+	Unused13           int32
 	Fpswtch            int32
 	Kmapent            int32
 }