diff --git a/libc/include/sys/linux-syscalls.h b/libc/include/sys/linux-syscalls.h
index c2c609d..d09e955 100644
--- a/libc/include/sys/linux-syscalls.h
+++ b/libc/include/sys/linux-syscalls.h
@@ -166,6 +166,7 @@
 #define __NR_fchmodat                     (__NR_SYSCALL_BASE + 333)
 #define __NR_renameat                     (__NR_SYSCALL_BASE + 329)
 #define __NR_unlinkat                     (__NR_SYSCALL_BASE + 328)
+#define __NR_faccessat                    (__NR_SYSCALL_BASE + 334)
 #define __NR_statfs64                     (__NR_SYSCALL_BASE + 266)
 #define __NR_clock_gettime                (__NR_SYSCALL_BASE + 263)
 #define __NR_clock_settime                (__NR_SYSCALL_BASE + 262)
@@ -227,6 +228,7 @@
 #define __NR_fchmodat                     (__NR_SYSCALL_BASE + 306)
 #define __NR_renameat                     (__NR_SYSCALL_BASE + 302)
 #define __NR_unlinkat                     (__NR_SYSCALL_BASE + 301)
+#define __NR_faccessat                    (__NR_SYSCALL_BASE + 307)
 #define __NR_statfs64                     (__NR_SYSCALL_BASE + 268)
 #define __NR_clock_gettime                (__NR_SYSCALL_BASE + 265)
 #define __NR_clock_settime                (__NR_SYSCALL_BASE + 264)
diff --git a/libc/include/unistd.h b/libc/include/unistd.h
index d92549f..d8263fe 100644
--- a/libc/include/unistd.h
+++ b/libc/include/unistd.h
@@ -107,6 +107,7 @@
 #define F_OK  0  /* Existence */
 
 extern int access(const char *, int);
+extern int faccessat(int, const char *, int, int);
 extern int link(const char *, const char *);
 extern int unlink(const char *);
 extern int chdir(const char *);