diff --git a/include/minix/ipc.h b/include/minix/ipc.h
index 4ea37f060..159341cd5 100644
--- a/include/minix/ipc.h
+++ b/include/minix/ipc.h
@@ -784,6 +784,13 @@ typedef struct {
 } mess_lsys_krn_sys_setalarm;
 _ASSERT_MSG_SIZE(mess_lsys_krn_sys_setalarm);
 
+typedef struct {
+	int request;
+
+	uint8_t padding[52];
+} mess_lsys_krn_sys_statectl;
+_ASSERT_MSG_SIZE(mess_lsys_krn_sys_statectl);
+
 typedef struct {
 	time_t boot_time;
 
@@ -1630,6 +1637,7 @@ typedef struct {
 		mess_lsys_krn_sys_memset m_lsys_krn_sys_memset;
 		mess_lsys_krn_sys_sdevio m_lsys_krn_sys_sdevio;
 		mess_lsys_krn_sys_setalarm m_lsys_krn_sys_setalarm;
+		mess_lsys_krn_sys_statectl m_lsys_krn_sys_statectl;
 		mess_lsys_krn_sys_stime	m_lsys_krn_sys_stime;
 		mess_lsys_krn_sys_settime m_lsys_krn_sys_settime;
 		mess_lsys_krn_sys_times	m_lsys_krn_sys_times;
diff --git a/kernel/system/do_statectl.c b/kernel/system/do_statectl.c
index 88818dd09..4118216da 100644
--- a/kernel/system/do_statectl.c
+++ b/kernel/system/do_statectl.c
@@ -2,7 +2,7 @@
  *   m_type:	SYS_STATECTL
  *
  * The parameters for this kernel call are:
- *    m2_i2:	CTL_REQUEST	(state control request)
+ *   m_lsys_krn_sys_statectl.request	(state control request)
  */
 
 #include "kernel/system.h"
@@ -16,7 +16,7 @@ int do_statectl(struct proc * caller, message * m_ptr)
 {
 /* Handle sys_statectl(). A process has issued a state control request. */
 
-  switch(m_ptr->CTL_REQUEST)
+  switch(m_ptr->m_lsys_krn_sys_statectl.request)
   {
   case SYS_STATE_CLEAR_IPC_REFS:
 	/* Clear IPC references for all the processes communicating
@@ -25,7 +25,8 @@ int do_statectl(struct proc * caller, message * m_ptr)
 	clear_ipc_refs(caller, EDEADSRCDST);
 	return(OK);
   default:
-	printf("do_statectl: bad request %d\n", m_ptr->CTL_REQUEST);
+	printf("do_statectl: bad request %d\n",
+		m_ptr->m_lsys_krn_sys_statectl.request);
 	return EINVAL;
   }
 }
diff --git a/lib/libsys/sys_statectl.c b/lib/libsys/sys_statectl.c
index d5d4ec7b5..40c9a1e11 100644
--- a/lib/libsys/sys_statectl.c
+++ b/lib/libsys/sys_statectl.c
@@ -4,7 +4,7 @@ int sys_statectl(int request)
 {
   message m;
 
-  m.CTL_REQUEST = request;
+  m.m_lsys_krn_sys_statectl.request = request;
 
   return _kernel_call(SYS_STATECTL, &m);
 }