diff --git a/include/minix/callnr.h b/include/minix/callnr.h
index e70fa1743..e8bd7a8d6 100644
--- a/include/minix/callnr.h
+++ b/include/minix/callnr.h
@@ -107,11 +107,6 @@
 #define PM_GROUPS_NUM		m1_i1	/* int */
 #define PM_GROUPS_PTR		m1_p1	/* gid_t * */
 
-/* Field names for the getpriority(2)/setpriority(2) calls. */
-#define PM_PRIORITY_WHICH	m1_i1	/* int */
-#define PM_PRIORITY_WHO		m1_i2	/* int */
-#define PM_PRIORITY_PRIO	m1_i3	/* int */
-
 /* Field names for the getmcontext(2)/setmcontext(2) calls. */
 #define PM_MCONTEXT_CTX		m1_p1	/* mcontext_t * */
 
diff --git a/include/minix/ipc.h b/include/minix/ipc.h
index e1ab66443..421380efb 100644
--- a/include/minix/ipc.h
+++ b/include/minix/ipc.h
@@ -154,6 +154,15 @@ typedef struct {
 } mess_lc_pm_itimer;
 _ASSERT_MSG_SIZE(mess_lc_pm_itimer);
 
+typedef struct {
+	int which;
+	int who;
+	int prio;
+
+	uint8_t padding[44];
+} mess_lc_pm_priority;
+_ASSERT_MSG_SIZE(mess_lc_pm_priority);
+
 typedef struct {
 	pid_t pid;
 	int req;
@@ -992,6 +1001,7 @@ typedef struct {
 		mess_fs_vfs_readwrite	m_fs_vfs_readwrite;
 
 		mess_lc_pm_itimer	m_lc_pm_itimer;
+		mess_lc_pm_priority	m_lc_pm_priority;
 		mess_lc_pm_ptrace	m_lc_pm_ptrace;
 		mess_lc_pm_sysuname	m_lc_pm_sysuname;
 		mess_lc_pm_time		m_lc_pm_time;
diff --git a/lib/libc/sys-minix/priority.c b/lib/libc/sys-minix/priority.c
index 5e6ea7f8d..74c4be52b 100644
--- a/lib/libc/sys-minix/priority.c
+++ b/lib/libc/sys-minix/priority.c
@@ -19,8 +19,8 @@ int getpriority(int which, id_t who)
 	message m;
 
 	memset(&m, 0, sizeof(m));
-	m.PM_PRIORITY_WHICH = which;
-	m.PM_PRIORITY_WHO = who;
+	m.m_lc_pm_priority.which = which;
+	m.m_lc_pm_priority.who = who;
 
 	/* GETPRIORITY returns negative for error.
 	 * Otherwise, it returns the priority plus the minimum
@@ -41,9 +41,9 @@ int setpriority(int which, id_t who, int prio)
 	message m;
 
 	memset(&m, 0, sizeof(m));
-	m.PM_PRIORITY_WHICH = which;
-	m.PM_PRIORITY_WHO = who;
-	m.PM_PRIORITY_PRIO = prio;
+	m.m_lc_pm_priority.which = which;
+	m.m_lc_pm_priority.who = who;
+	m.m_lc_pm_priority.prio = prio;
 
 	return _syscall(PM_PROC_NR, PM_SETPRIORITY, &m);
 }
diff --git a/servers/pm/misc.c b/servers/pm/misc.c
index 4d9e05aa3..8c1d32b54 100644
--- a/servers/pm/misc.c
+++ b/servers/pm/misc.c
@@ -247,9 +247,9 @@ int do_getsetpriority()
 	int r, arg_which, arg_who, arg_pri;
 	struct mproc *rmp;
 
-	arg_which = m_in.PM_PRIORITY_WHICH;
-	arg_who = m_in.PM_PRIORITY_WHO;
-	arg_pri = m_in.PM_PRIORITY_PRIO;	/* for SETPRIORITY */
+	arg_which = m_in.m_lc_pm_priority.which;
+	arg_who = m_in.m_lc_pm_priority.who;
+	arg_pri = m_in.m_lc_pm_priority.prio;	/* for SETPRIORITY */
 
 	/* Code common to GETPRIORITY and SETPRIORITY. */