diff --git a/sys/compat/linux/linux_fork.h b/sys/compat/linux/linux_fork.h
--- a/sys/compat/linux/linux_fork.h
+++ b/sys/compat/linux/linux_fork.h
@@ -32,7 +32,7 @@
 #define	LINUX_CLONE_FS			0x00000200
 #define	LINUX_CLONE_FILES		0x00000400
 #define	LINUX_CLONE_SIGHAND		0x00000800
-#define	LINUX_CLONE_PID			0x00001000	/* No longer exist in Linux */
+#define	LINUX_CLONE_PIDFD		0x00001000	/* since Linux 5.2 */
 #define	LINUX_CLONE_PTRACE		0x00002000
 #define	LINUX_CLONE_VFORK		0x00004000
 #define	LINUX_CLONE_PARENT		0x00008000