diff --git a/libc/include/sys/stat.h b/libc/include/sys/stat.h
index b8e3cb1..14b5224 100644
--- a/libc/include/sys/stat.h
+++ b/libc/include/sys/stat.h
@@ -151,46 +151,46 @@
 #define S_TYPEISSHM(__sb) 0
 #define S_TYPEISTMO(__sb) 0
 
-int chmod(const char*, mode_t);
-int fchmod(int, mode_t);
-int mkdir(const char*, mode_t);
+int chmod(const char* __path, mode_t __mode);
+int fchmod(int __fd, mode_t __mode);
+int mkdir(const char* __path, mode_t __mode);
 
-int fstat(int, struct stat*);
-int fstat64(int, struct stat64*) __INTRODUCED_IN(21);
-int fstatat(int, const char*, struct stat*, int);
-int fstatat64(int, const char*, struct stat64*, int) __INTRODUCED_IN(21);
-int lstat(const char*, struct stat*);
-int lstat64(const char*, struct stat64*) __INTRODUCED_IN(21);
-int stat(const char*, struct stat*);
-int stat64(const char*, struct stat64*) __INTRODUCED_IN(21);
+int fstat(int __fd, struct stat* __buf);
+int fstat64(int __fd, struct stat64* __buf) __INTRODUCED_IN(21);
+int fstatat(int __dir_fd, const char* __path, struct stat* __buf, int __flags);
+int fstatat64(int __dir_fd, const char* __path, struct stat64* __buf, int __flags) __INTRODUCED_IN(21);
+int lstat(const char* __path, struct stat* __buf);
+int lstat64(const char* __path, struct stat64* __buf) __INTRODUCED_IN(21);
+int stat(const char* __path, struct stat* __buf);
+int stat64(const char* __path, struct stat64* __buf) __INTRODUCED_IN(21);
 
-int mknod(const char*, mode_t, dev_t);
-mode_t umask(mode_t) __overloadable __RENAME_CLANG(umask);
+int mknod(const char* __path, mode_t __mode, dev_t __dev);
+mode_t umask(mode_t __mask) __overloadable __RENAME_CLANG(umask);
 
 #if defined(__BIONIC_INCLUDE_FORTIFY_HEADERS)
 #include <bits/fortify/stat.h>
 #endif
 
 #if __ANDROID_API__ >= __ANDROID_API_L__
-int mkfifo(const char*, mode_t) __INTRODUCED_IN(21);
+int mkfifo(const char* __path, mode_t __mode) __INTRODUCED_IN(21);
 #else
 // Implemented as a static inline before 21.
 #endif
 
-int mkfifoat(int, const char*, mode_t) __INTRODUCED_IN(23);
+int mkfifoat(int __dir_fd, const char* __path, mode_t __mode) __INTRODUCED_IN(23);
 
-int fchmodat(int, const char*, mode_t, int);
-int mkdirat(int, const char*, mode_t);
-int mknodat(int, const char*, mode_t, dev_t) __INTRODUCED_IN(21);
+int fchmodat(int __dir_fd, const char* __path, mode_t __mode, int __flags);
+int mkdirat(int __dir_fd, const char* __path, mode_t __mode);
+int mknodat(int __dir_fd, const char* __path, mode_t __mode, dev_t __dev) __INTRODUCED_IN(21);
 
 #define UTIME_NOW  ((1L << 30) - 1L)
 #define UTIME_OMIT ((1L << 30) - 2L)
-int utimensat(int fd, const char* path, const struct timespec times[2], int flags)
+int utimensat(int __dir_fd, const char* __path, const struct timespec __times[2], int __flags)
   __INTRODUCED_IN(12);
-int futimens(int fd, const struct timespec times[2]) __INTRODUCED_IN(19);
+int futimens(int __dir_fd, const struct timespec __times[2]) __INTRODUCED_IN(19);
 
 __END_DECLS
 
 #include <android/legacy_sys_stat_inlines.h>
 
-#endif /* _SYS_STAT_H_ */
+#endif