diff --git a/src/syscall/route_freebsd_32bit.go b/src/syscall/route_freebsd_32bit.go
index c70f0bb0d3..14373abd97 100644
--- a/src/syscall/route_freebsd_32bit.go
+++ b/src/syscall/route_freebsd_32bit.go
@@ -22,12 +22,9 @@ func (any *anyMessage) parseInterfaceMessage(b []byte) *InterfaceMessage {
 	// FreeBSD 10 and beyond have a restructured mbuf
 	// packet header view.
 	// See https://svnweb.freebsd.org/base?view=revision&revision=254804.
-	if supportsABI(1000000) {
-		m := (*ifMsghdr)(unsafe.Pointer(any))
-		p.Header.Data.Hwassist = uint32(m.Data.Hwassist)
-		p.Header.Data.Epoch = m.Data.Epoch
-		p.Header.Data.Lastchange = m.Data.Lastchange
-		return &InterfaceMessage{Header: p.Header, Data: b[int(unsafe.Offsetof(p.Header.Data))+int(p.Header.Data.Datalen) : any.Msglen]}
-	}
+	m := (*ifMsghdr)(unsafe.Pointer(any))
+	p.Header.Data.Hwassist = uint32(m.Data.Hwassist)
+	p.Header.Data.Epoch = m.Data.Epoch
+	p.Header.Data.Lastchange = m.Data.Lastchange
 	return &InterfaceMessage{Header: p.Header, Data: b[int(unsafe.Offsetof(p.Header.Data))+int(p.Header.Data.Datalen) : any.Msglen]}
 }
diff --git a/src/syscall/syscall_freebsd.go b/src/syscall/syscall_freebsd.go
index 0100f4cd14..0f3912644b 100644
--- a/src/syscall/syscall_freebsd.go
+++ b/src/syscall/syscall_freebsd.go
@@ -12,27 +12,13 @@
 
 package syscall
 
-import (
-	"sync"
-	"unsafe"
-)
+import "unsafe"
 
 func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
 func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
 func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
 func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
 
-// See https://www.freebsd.org/doc/en_US.ISO8859-1/books/porters-handbook/versions.html.
-var (
-	osreldateOnce sync.Once
-	osreldate     uint32
-)
-
-func supportsABI(ver uint32) bool {
-	osreldateOnce.Do(func() { osreldate, _ = SysctlUint32("kern.osreldate") })
-	return osreldate >= ver
-}
-
 type SockaddrDatalink struct {
 	Len    uint8
 	Family uint8