diff --git a/libc/kernel/uapi/linux/signal.h b/libc/kernel/uapi/linux/signal.h
index b8d7428..e9663ec 100644
--- a/libc/kernel/uapi/linux/signal.h
+++ b/libc/kernel/uapi/linux/signal.h
@@ -23,4 +23,7 @@
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SS_ONSTACK 1
 #define SS_DISABLE 2
+#define SS_AUTODISARM (1U << 31)
+#define SS_FLAG_BITS SS_AUTODISARM
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif