diff --git a/VAX/vax_cpu.c b/VAX/vax_cpu.c
index 64485fc0..1d98cb5b 100644
--- a/VAX/vax_cpu.c
+++ b/VAX/vax_cpu.c
@@ -3185,7 +3185,7 @@ return j;
 
 void cpu_idle (void)
 {
-sim_activate_abs (&cpu_unit, 0);
+sim_activate (&cpu_unit, 0);
 return;
 }
 
@@ -3193,7 +3193,7 @@ return;
 
 t_stat cpu_idle_svc (UNIT *uptr)
 {
-sim_idle (TMR_CLK, FALSE);
+sim_idle (TMR_CLK, TRUE);
 return SCPE_OK;
 }
 
diff --git a/VAX/vax_syscm.c b/VAX/vax_syscm.c
index 5bd8a429..7c7328d1 100644
--- a/VAX/vax_syscm.c
+++ b/VAX/vax_syscm.c
@@ -34,8 +34,6 @@
 #include "vax_defs.h"
 #include <ctype.h>
 
-extern UNIT cpu_unit;
-
 /* Symbol tables */
 /* Warning: for literals, the class number MUST equal the field width!! */