diff --git a/minix/kernel/system/do_sprofile.c b/minix/kernel/system/do_sprofile.c
index 581e35075..d84e22c95 100644
--- a/minix/kernel/system/do_sprofile.c
+++ b/minix/kernel/system/do_sprofile.c
@@ -77,7 +77,7 @@ int do_sprofile(struct proc * caller, message * m_ptr)
 			break;
 		case PROF_NMI:
 			err = nmi_watchdog_start_profiling(
-				_ptr->m_lsys_krn_sys_sprof.freq);
+				m_ptr->m_lsys_krn_sys_sprof.freq);
 			if (err)
 				return err;
 			break;
diff --git a/minix/servers/pm/profile.c b/minix/servers/pm/profile.c
index 682a2b05d..1fb53adc6 100644
--- a/minix/servers/pm/profile.c
+++ b/minix/servers/pm/profile.c
@@ -30,7 +30,7 @@ int do_sprofile(void)
   case PROF_START:
 	return sys_sprof(PROF_START, m_in.m_lc_pm_sprof.mem_size,
 		m_in.m_lc_pm_sprof.freq, m_in.m_lc_pm_sprof.intr_type, who_e,
-		m_in.m_lc_pm_sprof.ctl_ptr, m_in.m_lc_pm_sprof.mem_ptr);
+		(void *)m_in.m_lc_pm_sprof.ctl_ptr, (void *)m_in.m_lc_pm_sprof.mem_ptr);
 
   case PROF_STOP:
 	return sys_sprof(PROF_STOP,0,0,0,0,0,0);