diff --git a/libc/SYSCALLS.TXT b/libc/SYSCALLS.TXT
index 2da38b70b..333efbaaf 100644
--- a/libc/SYSCALLS.TXT
+++ b/libc/SYSCALLS.TXT
@@ -181,7 +181,7 @@ int           nanosleep(const struct timespec *, struct timespec *)   162
 int           clock_gettime(clockid_t clk_id, struct timespec *tp)    263,265
 int           clock_settime(clockid_t clk_id, const struct timespec *tp)  262,264
 int           clock_getres(clockid_t clk_id, struct timespec *res)   264,266
-int           clock_nanosleep(const struct timespec *req, struct timespec *rem)  265,267
+int           clock_nanosleep(clockid_t clock_id, int flags, const struct timespec *req, struct timespec *rem)  265,267
 int           getitimer(int, const struct itimerval *)   105
 int           setitimer(int, const struct itimerval *, struct itimerval *)  104
 int           __timer_create:timer_create(clockid_t clockid, struct sigevent *evp, timer_t *timerid)    257,259
diff --git a/libc/arch-x86/syscalls/clock_nanosleep.S b/libc/arch-x86/syscalls/clock_nanosleep.S
index c400e3ffe..23e1e6f04 100644
--- a/libc/arch-x86/syscalls/clock_nanosleep.S
+++ b/libc/arch-x86/syscalls/clock_nanosleep.S
@@ -9,8 +9,12 @@
 clock_nanosleep:
     pushl   %ebx
     pushl   %ecx
-    mov     12(%esp), %ebx
-    mov     16(%esp), %ecx
+    pushl   %edx
+    pushl   %esi
+    mov     20(%esp), %ebx
+    mov     24(%esp), %ecx
+    mov     28(%esp), %edx
+    mov     32(%esp), %esi
     movl    $__NR_clock_nanosleep, %eax
     int     $0x80
     cmpl    $-129, %eax
@@ -21,6 +25,8 @@ clock_nanosleep:
     addl    $4, %esp
     orl     $-1, %eax
 1:
+    popl    %esi
+    popl    %edx
     popl    %ecx
     popl    %ebx
     ret
diff --git a/libc/include/sys/linux-unistd.h b/libc/include/sys/linux-unistd.h
index d945d87b4..8422d7e6e 100644
--- a/libc/include/sys/linux-unistd.h
+++ b/libc/include/sys/linux-unistd.h
@@ -142,7 +142,7 @@ int              nanosleep (const struct timespec *, struct timespec *);
 int              clock_gettime (clockid_t clk_id, struct timespec *tp);
 int              clock_settime (clockid_t clk_id, const struct timespec *tp);
 int              clock_getres (clockid_t clk_id, struct timespec *res);
-int              clock_nanosleep (const struct timespec *req, struct timespec *rem);
+int              clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req, struct timespec *rem);
 int              getitimer (int, const struct itimerval *);
 int              setitimer (int, const struct itimerval *, struct itimerval *);
 int              __timer_create (clockid_t clockid, struct sigevent *evp, timer_t *timerid);