diff --git a/libc/bionic/fchmod.cpp b/libc/bionic/fchmod.cpp
index 6e020b6..ace8c6b 100644
--- a/libc/bionic/fchmod.cpp
+++ b/libc/bionic/fchmod.cpp
@@ -33,11 +33,11 @@
 #include <unistd.h>
 #include <stdio.h>
 
-extern "C" int __fchmod(int, mode_t);
+extern "C" int ___fchmod(int, mode_t);
 
 int fchmod(int fd, mode_t mode) {
   int saved_errno = errno;
-  int result = __fchmod(fd, mode);
+  int result = ___fchmod(fd, mode);
 
   if ((result == 0) || (errno != EBADF)) {
     return result;
diff --git a/libc/bionic/fchmodat.cpp b/libc/bionic/fchmodat.cpp
index c28e15a..1f83c4b 100644
--- a/libc/bionic/fchmodat.cpp
+++ b/libc/bionic/fchmodat.cpp
@@ -34,7 +34,7 @@
 
 #include "private/ErrnoRestorer.h"
 
-extern "C" int __fchmodat(int, const char*, mode_t);
+extern "C" int ___fchmodat(int, const char*, mode_t);
 
 int fchmodat(int dirfd, const char* pathname, mode_t mode, int flags) {
   if ((flags & ~AT_SYMLINK_NOFOLLOW) != 0) {
@@ -63,5 +63,5 @@
     return result;
   }
 
-  return __fchmodat(dirfd, pathname, mode);
+  return ___fchmodat(dirfd, pathname, mode);
 }