diff --git a/libc/kernel/uapi/linux/prctl.h b/libc/kernel/uapi/linux/prctl.h
index 2890747..6095881 100644
--- a/libc/kernel/uapi/linux/prctl.h
+++ b/libc/kernel/uapi/linux/prctl.h
@@ -162,6 +162,11 @@
 #define PR_MTE_TAG_MASK (0xffffUL << PR_MTE_TAG_SHIFT)
 #define PR_SET_IO_FLUSHER 57
 #define PR_GET_IO_FLUSHER 58
+#define PR_SET_SYSCALL_USER_DISPATCH 59
+#define PR_SYS_DISPATCH_OFF 0
+#define PR_SYS_DISPATCH_ON 1
+#define SYSCALL_DISPATCH_FILTER_ALLOW 0
+#define SYSCALL_DISPATCH_FILTER_BLOCK 1
 #define PR_SET_VMA 0x53564d41
 #define PR_SET_VMA_ANON_NAME 0
 #endif