diff --git a/sys/kern/kern_procctl.c b/sys/kern/kern_procctl.c
--- a/sys/kern/kern_procctl.c
+++ b/sys/kern/kern_procctl.c
@@ -656,15 +656,6 @@
 	return (0);
 }
 
-#ifndef _SYS_SYSPROTO_H_
-struct procctl_args {
-	idtype_t idtype;
-	id_t	id;
-	int	com;
-	void	*data;
-};
-#endif
-/* ARGSUSED */
 int
 sys_procctl(struct thread *td, struct procctl_args *uap)
 {