diff --git a/VAX/vax750_stddev.c b/VAX/vax750_stddev.c
index 78355848..d3685250 100644
--- a/VAX/vax750_stddev.c
+++ b/VAX/vax750_stddev.c
@@ -535,7 +535,7 @@ t_stat tti_svc (UNIT *uptr)
 {
 int32 c;
 
-sim_clock_coschedule_tmr (uptr, TMR_CLK, tmxr_poll);    /* continue poll */
+sim_clock_coschedule_tmr (uptr, TMR_CLK, TMXR_MULT);    /* continue poll */
 
 if ((tti_csr & CSR_DONE) &&                             /* input still pending and < 500ms? */
     ((sim_os_msec () - tti_buftime) < 500))
diff --git a/VAX/vax780_stddev.c b/VAX/vax780_stddev.c
index 68c3b707..c46076b4 100644
--- a/VAX/vax780_stddev.c
+++ b/VAX/vax780_stddev.c
@@ -503,7 +503,7 @@ t_stat tti_svc (UNIT *uptr)
 {
 int32 c;
 
-sim_clock_coschedule_tmr (uptr, TMR_CLK, tmxr_poll);    /* continue poll */
+sim_clock_coschedule_tmr (uptr, TMR_CLK, TMXR_MULT);    /* continue poll */
 
 if ((tti_csr & CSR_DONE) &&                             /* input still pending and < 500ms? */
     ((sim_os_msec () - tti_buftime) < 500))
diff --git a/VAX/vax860_stddev.c b/VAX/vax860_stddev.c
index b3396932..4d2242fa 100644
--- a/VAX/vax860_stddev.c
+++ b/VAX/vax860_stddev.c
@@ -591,7 +591,7 @@ int32 line = uptr - tti_dev.units;
 switch (line) {
 
     case ID_CT:                                         /* console terminal */
-        sim_clock_coschedule_tmr (uptr, TMR_CLK, tmxr_poll);/* continue poll */
+        sim_clock_coschedule_tmr (uptr, TMR_CLK, TMXR_MULT);/* continue poll */
         if ((tti_csr & CSR_DONE) &&                     /* input still pending and < 500ms? */
             ((sim_os_msec () - tti_buftime) < 500))
              return SCPE_OK;
diff --git a/VAX/vax_stddev.c b/VAX/vax_stddev.c
index abfc8f72..51918c52 100644
--- a/VAX/vax_stddev.c
+++ b/VAX/vax_stddev.c
@@ -345,7 +345,7 @@ t_stat tti_svc (UNIT *uptr)
 {
 int32 c;
 
-sim_clock_coschedule_tmr (uptr, TMR_CLK, tmxr_poll);    /* continue poll */
+sim_clock_coschedule_tmr (uptr, TMR_CLK, TMXR_MULT);    /* continue poll */
 
 if ((tti_csr & CSR_DONE) &&                             /* input still pending and < 500ms? */
     ((sim_os_msec () - tti_buftime) < 500))