diff --git a/std/c/freebsd.zig b/std/c/freebsd.zig
index 86213ee1b3..f30d57da3b 100644
--- a/std/c/freebsd.zig
+++ b/std/c/freebsd.zig
@@ -15,6 +15,8 @@ pub extern "c" fn sysctlbyname(name: [*]const u8, oldp: ?*c_void, oldlenp: ?*usi
 pub extern "c" fn sysctlnametomib(name: [*]const u8, mibp: ?*c_int, sizep: ?*usize) c_int;
 pub extern "c" fn getdirentries(fd: c_int, buf_ptr: [*]u8, nbytes: usize, basep: *i64) usize;
 pub extern "c" fn pipe2(arg0: *[2]c_int, arg1: u32) c_int;
+pub extern "c" fn preadv(fd: c_int, iov: *const c_void, iovcnt: c_int, offset: usize) isize;
+pub extern "c" fn pwritev(fd: c_int, iov: *const c_void, iovcnt: c_int, offset: usize) isize;
 
 /// Renamed from `kevent` to `Kevent` to avoid conflict with function name.
 pub const Kevent = extern struct {
@@ -50,18 +52,23 @@ pub const Stat = extern struct {
     nlink: usize,
 
     mode: u32,
+    __pad0: u16,
     uid: u32,
     gid: u32,
-    __pad0: u32,
+    __pad1: u32,
     rdev: u64,
-    size: i64,
-    blksize: isize,
-    blocks: i64,
 
     atim: timespec,
     mtim: timespec,
     ctim: timespec,
-    __unused: [3]isize,
+    birthtim: timespec,
+
+    size: i64,
+    blocks: i64,
+    blksize: isize,
+    flags: u32,
+    gen: u64,
+    __spare: [10]u64,
 };
 
 pub const timespec = extern struct {
@@ -72,7 +79,7 @@ pub const timespec = extern struct {
 pub const dirent = extern struct {
     d_fileno: usize,
     d_off: i64,
-    d_reclen: u64,
+    d_reclen: u16,
     d_type: u8,
     d_pad0: u8,
     d_namlen: u16,
diff --git a/std/os/freebsd/index.zig b/std/os/freebsd/index.zig
index 47f4e8e267..1e08afe26d 100644
--- a/std/os/freebsd/index.zig
+++ b/std/os/freebsd/index.zig
@@ -626,7 +626,7 @@ pub fn pread(fd: i32, buf: [*]u8, nbyte: usize, offset: u64) usize {
 }
 
 pub fn preadv(fd: i32, iov: [*]const iovec, count: usize, offset: usize) usize {
-    return arch.syscall4(SYS_preadv, @bitCast(usize, isize(fd)), @ptrToInt(iov), count, offset);
+    return errnoWrap(c.preadv(fd, @ptrCast(*const c_void, iov), @intCast(c_int, count), offset));
 }
 
 pub fn pipe(fd: *[2]i32) usize {
@@ -647,7 +647,7 @@ pub fn pwrite(fd: i32, buf: [*]const u8, nbyte: usize, offset: u64) usize {
 }
 
 pub fn pwritev(fd: i32, iov: [*]const iovec_const, count: usize, offset: usize) usize {
-    return arch.syscall4(SYS_pwritev, @bitCast(usize, isize(fd)), @ptrToInt(iov), count, offset);
+    return errnoWrap(c.pwritev(fd, @ptrCast(*const c_void, iov), @intCast(c_int, count), offset));
 }
 
 pub fn rename(old: [*]const u8, new: [*]const u8) usize {