diff --git a/lib/std/c/darwin.zig b/lib/std/c/darwin.zig
index b9fc59a1a7..b384fcf845 100644
--- a/lib/std/c/darwin.zig
+++ b/lib/std/c/darwin.zig
@@ -161,67 +161,13 @@ pub extern "c" fn _dyld_get_image_header(image_index: u32) ?*mach_header;
 pub extern "c" fn _dyld_get_image_vmaddr_slide(image_index: u32) usize;
 pub extern "c" fn _dyld_get_image_name(image_index: u32) [*:0]const u8;
 
-pub const COPYFILE = struct {
-    pub const ACL = 1 << 0;
-    pub const STAT = 1 << 1;
-    pub const XATTR = 1 << 2;
-    pub const DATA = 1 << 3;
-    pub const SECURITY = COPYFILE.STAT | COPYFILE.ACL;
-    pub const METADATA = COPYFILE.SECURITY | COPYFILE.XATTR;
-    pub const ALL = COPYFILE.METADATA | COPYFILE.DATA;
-    pub const RECURSIVE = 1 << 15;
-    pub const CHECK = 1 << 16;
-    pub const EXCL = 1 << 17;
-    pub const NOFOLLOW_SRC = 1 << 18;
-    pub const NOFOLLOW_DST = 1 << 19;
-    pub const MOVE = 1 << 20;
-    pub const UNLINK = 1 << 21;
-    pub const NOFOLLOW = COPYFILE.NOFOLLOW_SRC | NOFOLLOW_DST;
-    pub const PACK = 1 << 22;
-    pub const UNPACK = 1 << 23;
-    pub const CLONE = 1 << 24;
-    pub const CLONE_FORCE = 1 << 25;
-    pub const RUN_IN_PLACE = 1 << 26;
-    pub const DATA_SPARSE = 1 << 27;
-    pub const PRESERVE_DST_TRACKED = 1 << 28;
-    pub const VERBOSE = 1 << 30;
-    pub const RECURSE_ERROR = 0;
-    pub const RECURSE_FILE = 1;
-    pub const RECURSE_DIR = 2;
-    pub const RECURSE_DIR_CLEANUP = 3;
-    pub const COPY_DATA = 4;
-    pub const COPY_XATTR = 5;
-    pub const START = 1;
-    pub const FINISH = 2;
-    pub const ERR = 3;
-    pub const PROGRESS = 4;
-    pub const CONTINUE = 0;
-    pub const SKIP = 1;
-    pub const QUIT = 2;
-    pub const STATE_SRC_FD = 1;
-    pub const STATE_SRC_FILENAME = 2;
-    pub const STATE_DST_FD = 3;
-    pub const STATE_DST_FILENAME = 4;
-    pub const STATE_QUARANTINE = 5;
-    pub const STATE_STATUS_CB = 6;
-    pub const STATE_STATUS_CTX = 7;
-    pub const STATE_COPIED = 8;
-    pub const STATE_XATTRNAME = 9;
-    pub const STATE_WAS_CLONED = 10;
-    pub const STATE_SRC_BSIZE = 11;
-    pub const STATE_DST_BSIZE = 12;
-    pub const STATE_BSIZE = 13;
-    pub const DISABLE_VAR: [*]u8 = "COPYFILE_DISABLE";
-};
+pub const COPYFILE_ACL = 1 << 0;
+pub const COPYFILE_STAT = 1 << 1;
+pub const COPYFILE_XATTR = 1 << 2;
+pub const COPYFILE_DATA = 1 << 3;
 
 pub const copyfile_state_t = *opaque {};
-pub const copyfile_flags_t = u32;
-pub extern "c" fn fcopyfile(from: fd_t, to: fd_t, state: ?copyfile_state_t, flags: copyfile_flags_t) c_int;
-pub extern "c" fn copyfile(from: [*:0]u8, to: [*:0]u8, state: ?copyfile_state_t, flags: copyfile_flags_t) c_int;
-pub extern "c" fn copyfile_state_alloc() copyfile_state_t;
-pub extern "c" fn copyfile_state_free(state: copyfile_state_t) void;
-pub extern "c" fn copyfile_state_get(s: copyfile_state_t, flag: u32, dst: ?*anyopaque) c_int;
-pub extern "c" fn copyfile_state_set(s: copyfile_state_t, flag: u32, dst: ?*const anyopaque) c_int;
+pub extern "c" fn fcopyfile(from: fd_t, to: fd_t, state: ?copyfile_state_t, flags: u32) c_int;
 
 pub extern "c" fn @"realpath$DARWIN_EXTSN"(noalias file_name: [*:0]const u8, noalias resolved_name: [*]u8) ?[*:0]u8;
 pub const realpath = @"realpath$DARWIN_EXTSN";
diff --git a/lib/std/fs.zig b/lib/std/fs.zig
index 89a0d3ab6f..de18a085e4 100644
--- a/lib/std/fs.zig
+++ b/lib/std/fs.zig
@@ -3120,7 +3120,7 @@ const CopyFileRawError = error{SystemResources} || os.CopyFileRangeError || os.S
 // No metadata is transferred over.
 fn copy_file(fd_in: os.fd_t, fd_out: os.fd_t, maybe_size: ?u64) CopyFileRawError!void {
     if (comptime builtin.target.isDarwin()) {
-        const rc = os.system.fcopyfile(fd_in, fd_out, null, os.system.COPYFILE.DATA);
+        const rc = os.system.fcopyfile(fd_in, fd_out, null, os.system.COPYFILE_DATA);
         switch (os.errno(rc)) {
             .SUCCESS => return,
             .INVAL => unreachable,