diff --git a/libc/include/fcntl.h b/libc/include/fcntl.h
index f27efdf..cd52b45 100644
--- a/libc/include/fcntl.h
+++ b/libc/include/fcntl.h
@@ -91,120 +91,9 @@
 int sync_file_range(int, off64_t, off64_t, unsigned int) __INTRODUCED_IN(26);
 #endif
 
-int __open_2(const char*, int) __INTRODUCED_IN(17);
-int __openat_2(int, const char*, int) __INTRODUCED_IN(17);
-/*
- * These are the easiest way to call the real open even in clang FORTIFY.
- */
-int __open_real(const char*, int, ...) __RENAME(open);
-int __openat_real(int, const char*, int, ...) __RENAME(openat);
-
-
-#if defined(__BIONIC_FORTIFY)
-#define __open_too_many_args_error "too many arguments"
-#define __open_too_few_args_error "called with O_CREAT, but missing mode"
-#if defined(__clang__)
-
-#if __ANDROID_API__ >= __ANDROID_API_J_MR1__
-__BIONIC_ERROR_FUNCTION_VISIBILITY
-int open(const char* pathname, int flags, mode_t modes, ...) __overloadable
-        __errorattr(__open_too_many_args_error);
-
-__BIONIC_ERROR_FUNCTION_VISIBILITY
-int open(const char* pathname, int flags) __overloadable
-        __enable_if(flags & O_CREAT, __open_too_few_args_error)
-        __errorattr(__open_too_few_args_error);
-
-/*
- * pass_object_size serves two purposes here, neither of which involve __bos: it
- * disqualifies this function from having its address taken (so &open works),
- * and it makes overload resolution prefer open(const char *, int) over
- * open(const char *, int, ...).
- */
-__BIONIC_FORTIFY_INLINE
-int open(const char* const __pass_object_size pathname,
-         int flags) __overloadable {
-    return __open_2(pathname, flags);
-}
-
-__BIONIC_FORTIFY_INLINE
-int open(const char* const __pass_object_size pathname, int flags, mode_t modes)
-        __overloadable {
-    return __open_real(pathname, flags, modes);
-}
-
-__BIONIC_ERROR_FUNCTION_VISIBILITY
-int openat(int dirfd, const char* pathname, int flags) __overloadable
-        __enable_if(flags & O_CREAT, __open_too_few_args_error)
-        __errorattr(__open_too_few_args_error);
-
-__BIONIC_ERROR_FUNCTION_VISIBILITY
-int openat(int dirfd, const char* pathname, int flags, mode_t modes, ...)
-        __overloadable
-        __errorattr(__open_too_many_args_error);
-
-__BIONIC_FORTIFY_INLINE
-int openat(int dirfd, const char* const __pass_object_size pathname,
-           int flags) __overloadable {
-    return __openat_2(dirfd, pathname, flags);
-}
-
-__BIONIC_FORTIFY_INLINE
-int openat(int dirfd, const char* const __pass_object_size pathname, int flags,
-           mode_t modes) __overloadable {
-    return __openat_real(dirfd, pathname, flags, modes);
-}
-#endif /* __ANDROID_API__ >= __ANDROID_API_J_MR1__ */
-
-#else /* defined(__clang__) */
-__errordecl(__creat_missing_mode, __open_too_few_args_error);
-__errordecl(__creat_too_many_args, __open_too_many_args_error);
-
-#if __ANDROID_API__ >= __ANDROID_API_J_MR1__
-__BIONIC_FORTIFY_INLINE
-int open(const char* pathname, int flags, ...) {
-    if (__builtin_constant_p(flags)) {
-        if ((flags & O_CREAT) && __builtin_va_arg_pack_len() == 0) {
-            __creat_missing_mode();  /* Compile time error. */
-        }
-    }
-
-    if (__builtin_va_arg_pack_len() > 1) {
-        __creat_too_many_args();  /* Compile time error. */
-    }
-
-    if ((__builtin_va_arg_pack_len() == 0) && !__builtin_constant_p(flags)) {
-        return __open_2(pathname, flags);
-    }
-
-    return __open_real(pathname, flags, __builtin_va_arg_pack());
-}
-
-__BIONIC_FORTIFY_INLINE
-int openat(int dirfd, const char* pathname, int flags, ...) {
-    if (__builtin_constant_p(flags)) {
-        if ((flags & O_CREAT) && __builtin_va_arg_pack_len() == 0) {
-            __creat_missing_mode();  /* Compile time error. */
-        }
-    }
-
-    if (__builtin_va_arg_pack_len() > 1) {
-        __creat_too_many_args();  /* Compile time error. */
-    }
-
-    if ((__builtin_va_arg_pack_len() == 0) && !__builtin_constant_p(flags)) {
-        return __openat_2(dirfd, pathname, flags);
-    }
-
-    return __openat_real(dirfd, pathname, flags, __builtin_va_arg_pack());
-}
-#endif /* __ANDROID_API__ >= __ANDROID_API_J_MR1__ */
-
-#endif /* defined(__clang__) */
-
-#undef __open_too_many_args_error
-#undef __open_too_few_args_error
-#endif /* defined(__BIONIC_FORTIFY) */
+#if defined(__BIONIC_INCLUDE_FORTIFY_HEADERS)
+#include <bits/fortify/fcntl.h>
+#endif
 
 __END_DECLS