Index: head/sys/compat/freebsd32/syscalls.master
===================================================================
--- head/sys/compat/freebsd32/syscalls.master
+++ head/sys/compat/freebsd32/syscalls.master
@@ -1164,5 +1164,8 @@
 				    char *buf, size_t size, int flags); }
 575	AUE_CLOSERANGE	NOPROTO	{ int close_range(u_int lowfd, u_int highfd, \
 				    int flags); }
+; 576 is initialised by the krpc code, if present.
+576	AUE_NULL	NOSTD|NOPROTO	{ int rpctls_syscall(int op, \
+				    const char *path); }
 
 ; vim: syntax=off
Index: head/sys/kern/syscalls.master
===================================================================
--- head/sys/kern/syscalls.master
+++ head/sys/kern/syscalls.master
@@ -3234,6 +3234,13 @@
 		    int flags
 		);
 	}
+; 576 is initialised by the krpc code, if present.
+576	AUE_NULL	NOSTD {
+		int rpctls_syscall(
+		    int op,
+		    _In_z_ const char *path
+		);
+	}
 
 ; Please copy any additions and changes to the following compatability tables:
 ; sys/compat/freebsd32/syscalls.master