diff --git a/lib/std/c.zig b/lib/std/c.zig
index 97d6bf5215..d4c70a9fe4 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -73,7 +73,6 @@ pub extern "c" fn abort() noreturn;
 pub extern "c" fn exit(code: c_int) noreturn;
 pub extern "c" fn isatty(fd: fd_t) c_int;
 pub extern "c" fn close(fd: fd_t) c_int;
-pub extern "c" fn fstatat(dirfd: fd_t, path: [*:0]const u8, stat_buf: *Stat, flags: u32) c_int;
 pub extern "c" fn lseek(fd: fd_t, offset: off_t, whence: c_int) off_t;
 pub extern "c" fn open(path: [*:0]const u8, oflag: c_uint, ...) c_int;
 pub extern "c" fn openat(fd: c_int, path: [*:0]const u8, oflag: c_uint, ...) c_int;
@@ -116,9 +115,11 @@ pub extern "c" fn readlinkat(dirfd: fd_t, noalias path: [*:0]const u8, noalias b
 pub usingnamespace switch (builtin.os.tag) {
     .macosx, .ios, .watchos, .tvos => struct {
         pub const realpath = @"realpath$DARWIN_EXTSN";
+        pub const fstatat = @"fstatat$INODE64";
     },
     else => struct {
         pub extern "c" fn realpath(noalias file_name: [*:0]const u8, noalias resolved_name: [*]u8) ?[*:0]u8;
+        pub extern "c" fn fstatat(dirfd: fd_t, path: [*:0]const u8, stat_buf: *Stat, flags: u32) c_int;
     },
 };
 
diff --git a/lib/std/c/darwin.zig b/lib/std/c/darwin.zig
index f827eb6863..2426638569 100644
--- a/lib/std/c/darwin.zig
+++ b/lib/std/c/darwin.zig
@@ -16,6 +16,7 @@ pub extern "c" fn @"realpath$DARWIN_EXTSN"(noalias file_name: [*:0]const u8, noa
 
 pub extern "c" fn __getdirentries64(fd: c_int, buf_ptr: [*]u8, buf_len: usize, basep: *i64) isize;
 pub extern "c" fn @"fstat$INODE64"(fd: fd_t, buf: *Stat) c_int;
+pub extern "c" fn @"fstatat$INODE64"(dirfd: fd_t, path_name: [*:0]const u8, buf: *Stat, flags: u32) c_int;
 
 pub extern "c" fn mach_absolute_time() u64;
 pub extern "c" fn mach_timebase_info(tinfo: ?*mach_timebase_info_data) void;