diff --git a/libc/SYSCALLS.TXT b/libc/SYSCALLS.TXT
index 526b6d0..e045049 100644
--- a/libc/SYSCALLS.TXT
+++ b/libc/SYSCALLS.TXT
@@ -223,6 +223,7 @@
 int           timerfd_create(clockid_t, int)   all
 int           timerfd_settime(int, int, const struct itimerspec*, struct itimerspec*)   all
 int           timerfd_gettime(int, struct itimerspec*)   all
+int           adjtimex(struct timex*)   all
 
 # signals
 int     __sigaction:sigaction(int, const struct sigaction*, struct sigaction*)  arm,mips,x86
diff --git a/libc/arch-arm/syscalls/adjtimex.S b/libc/arch-arm/syscalls/adjtimex.S
new file mode 100644
index 0000000..614036e
--- /dev/null
+++ b/libc/arch-arm/syscalls/adjtimex.S
@@ -0,0 +1,14 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(adjtimex)
+    mov     ip, r7
+    ldr     r7, =__NR_adjtimex
+    swi     #0
+    mov     r7, ip
+    cmn     r0, #(MAX_ERRNO + 1)
+    bxls    lr
+    neg     r0, r0
+    b       __set_errno_internal
+END(adjtimex)
diff --git a/libc/arch-arm64/syscalls/adjtimex.S b/libc/arch-arm64/syscalls/adjtimex.S
new file mode 100644
index 0000000..712e468
--- /dev/null
+++ b/libc/arch-arm64/syscalls/adjtimex.S
@@ -0,0 +1,14 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(adjtimex)
+    mov     x8, __NR_adjtimex
+    svc     #0
+
+    cmn     x0, #(MAX_ERRNO + 1)
+    cneg    x0, x0, hi
+    b.hi    __set_errno_internal
+
+    ret
+END(adjtimex)
diff --git a/libc/arch-mips/syscalls/adjtimex.S b/libc/arch-mips/syscalls/adjtimex.S
new file mode 100644
index 0000000..fef215f
--- /dev/null
+++ b/libc/arch-mips/syscalls/adjtimex.S
@@ -0,0 +1,19 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(adjtimex)
+    .set noreorder
+    .cpload t9
+    li v0, __NR_adjtimex
+    syscall
+    bnez a3, 1f
+    move a0, v0
+    j ra
+    nop
+1:
+    la t9,__set_errno_internal
+    j t9
+    nop
+    .set reorder
+END(adjtimex)
diff --git a/libc/arch-mips64/syscalls/adjtimex.S b/libc/arch-mips64/syscalls/adjtimex.S
new file mode 100644
index 0000000..57b012c
--- /dev/null
+++ b/libc/arch-mips64/syscalls/adjtimex.S
@@ -0,0 +1,25 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(adjtimex)
+    .set push
+    .set noreorder
+    li v0, __NR_adjtimex
+    syscall
+    bnez a3, 1f
+    move a0, v0
+    j ra
+    nop
+1:
+    move t0, ra
+    bal     2f
+    nop
+2:
+    .cpsetup ra, t1, 2b
+    LA t9,__set_errno_internal
+    .cpreturn
+    j t9
+    move ra, t0
+    .set pop
+END(adjtimex)
diff --git a/libc/arch-x86/syscalls/adjtimex.S b/libc/arch-x86/syscalls/adjtimex.S
new file mode 100644
index 0000000..2a91f90
--- /dev/null
+++ b/libc/arch-x86/syscalls/adjtimex.S
@@ -0,0 +1,21 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(adjtimex)
+    pushl   %ebx
+    .cfi_def_cfa_offset 8
+    .cfi_rel_offset ebx, 0
+    mov     8(%esp), %ebx
+    movl    $__NR_adjtimex, %eax
+    int     $0x80
+    cmpl    $-MAX_ERRNO, %eax
+    jb      1f
+    negl    %eax
+    pushl   %eax
+    call    __set_errno_internal
+    addl    $4, %esp
+1:
+    popl    %ebx
+    ret
+END(adjtimex)
diff --git a/libc/arch-x86_64/syscalls/adjtimex.S b/libc/arch-x86_64/syscalls/adjtimex.S
new file mode 100644
index 0000000..292b9f3
--- /dev/null
+++ b/libc/arch-x86_64/syscalls/adjtimex.S
@@ -0,0 +1,15 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(adjtimex)
+    movl    $__NR_adjtimex, %eax
+    syscall
+    cmpq    $-MAX_ERRNO, %rax
+    jb      1f
+    negl    %eax
+    movl    %eax, %edi
+    call    __set_errno_internal
+1:
+    ret
+END(adjtimex)
diff --git a/libc/include/sys/timex.h b/libc/include/sys/timex.h
index 4096e7d..6138ac4 100644
--- a/libc/include/sys/timex.h
+++ b/libc/include/sys/timex.h
@@ -29,6 +29,13 @@
 #ifndef _SYS_TIMEX_H_
 #define _SYS_TIMEX_H_
 
+#include <sys/cdefs.h>
 #include <linux/timex.h>
 
+__BEGIN_DECLS
+
+extern int adjtimex(struct timex *buf);
+
+__END_DECLS
+
 #endif /* _SYS_TIMEX_H_ */