diff --git a/unix/syscall_linux.go b/unix/syscall_linux.go
index d839962e..bea511fc 100644
--- a/unix/syscall_linux.go
+++ b/unix/syscall_linux.go
@@ -1999,7 +1999,7 @@ func appendBytes(vecs []Iovec, bs [][]byte) []Iovec {
 // offs2lohi splits offs into its low and high order bits.
 func offs2lohi(offs int64) (lo, hi uintptr) {
 	const longBits = SizeofLong * 8
-	return uintptr(offs), uintptr(uint64(offs) >> longBits)
+	return uintptr(offs), uintptr(uint64(offs) >> (longBits - 1) >> 1) // two shifts to avoid false positive in vet
 }
 
 func Readv(fd int, iovs [][]byte) (n int, err error) {