diff --git a/sys_darwin.zig b/sys_darwin.zig
index a1f2973163395999c059c44851aeb9a407acb5a7..e8d5f085137bcd5ef8c2a4b443b59e46c3f6665f 100644
--- a/sys_darwin.zig
+++ b/sys_darwin.zig
@@ -280,6 +280,7 @@ pub const libc = struct {
     pub extern fn lseek(fd: c_int, offset: off_t, whence: c_int) off_t;
     pub extern fn getcwd(buf: [*]u8, size: usize) ?[*:0]u8;
     pub extern fn fchmod(fildes: c_int, mode: mode_t) c_int;
+    pub extern fn faccessat(fd: c_int, path: [*:0]const u8, amode: c_int, flag: c_int) c_int;
 };
 
 pub const natural_t = c_uint;
@@ -569,3 +570,8 @@ pub fn fchmod(fd: c_int, mode: mode_t) !void {
     if (rc == -1) return errno.fromInt(errno.fromLibC());
     std.debug.assert(rc == 0);
 }
+pub fn faccessat(fd: c_int, path: [*:0]const u8, amode: c_int, flag: c_int) !void {
+    const rc = libc.faccessat(fd, path, amode, flag);
+    if (rc == -1) return errno.fromInt(errno.fromLibC());
+    std.debug.assert(rc == 0);
+}