diff --git a/libc/kernel/uapi/linux/sched.h b/libc/kernel/uapi/linux/sched.h
index 20d4956..0460083 100644
--- a/libc/kernel/uapi/linux/sched.h
+++ b/libc/kernel/uapi/linux/sched.h
@@ -23,6 +23,7 @@
 #define CLONE_FS 0x00000200
 #define CLONE_FILES 0x00000400
 #define CLONE_SIGHAND 0x00000800
+#define CLONE_PIDFD 0x00001000
 #define CLONE_PTRACE 0x00002000
 #define CLONE_VFORK 0x00004000
 #define CLONE_PARENT 0x00008000