diff --git a/libc/kernel/uapi/linux/prctl.h b/libc/kernel/uapi/linux/prctl.h
index 87c7e2f..baa597e 100644
--- a/libc/kernel/uapi/linux/prctl.h
+++ b/libc/kernel/uapi/linux/prctl.h
@@ -117,7 +117,8 @@
 #define PR_GET_NO_NEW_PRIVS 39
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PR_GET_TID_ADDRESS 40
+#define PR_SET_TIMERSLACK_PID 41
 #define PR_SET_VMA 0x53564d41
 #define PR_SET_VMA_ANON_NAME 0
-#endif
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#endif