diff --git a/VAX/vax730_stddev.c b/VAX/vax730_stddev.c
index 7ec23d6a..cb739b75 100644
--- a/VAX/vax730_stddev.c
+++ b/VAX/vax730_stddev.c
@@ -782,7 +782,7 @@ return SCPE_OK;
 
 t_stat clk_svc (UNIT *uptr)
 {
-int32_t t;
+int32 t;
 t = sim_rtcn_calb (clk_tps, TMR_CLK);                   /* calibrate clock */
 sim_activate_after (uptr, 1000000/clk_tps);             /* reactivate unit */
 tmr_poll = t;                                           /* set tmr poll */
diff --git a/VAX/vax780_stddev.c b/VAX/vax780_stddev.c
index 1beee8d1..1689a5c1 100644
--- a/VAX/vax780_stddev.c
+++ b/VAX/vax780_stddev.c
@@ -751,7 +751,7 @@ return SCPE_OK;
 
 t_stat clk_svc (UNIT *uptr)
 {
-int32_t t;
+int32 t;
 t = sim_rtcn_calb (clk_tps, TMR_CLK);                   /* calibrate clock */
 sim_activate_after (uptr, 1000000/clk_tps);             /* reactivate unit */
 tmr_poll = t;                                           /* set tmr poll */
diff --git a/VAX/vax820_stddev.c b/VAX/vax820_stddev.c
index baa71ae7..ab30ec88 100644
--- a/VAX/vax820_stddev.c
+++ b/VAX/vax820_stddev.c
@@ -784,7 +784,7 @@ return SCPE_OK;
 
 t_stat clk_svc (UNIT *uptr)
 {
-int32_t t;
+int32 t;
 t = sim_rtcn_calb (clk_tps, TMR_CLK);                   /* calibrate clock */
 sim_activate_after (uptr, 1000000/clk_tps);             /* reactivate unit */
 tmr_poll = t;                                           /* set tmr poll */
diff --git a/VAX/vax860_stddev.c b/VAX/vax860_stddev.c
index 85ad6abc..5ead283f 100644
--- a/VAX/vax860_stddev.c
+++ b/VAX/vax860_stddev.c
@@ -886,7 +886,7 @@ return SCPE_OK;
 
 t_stat clk_svc (UNIT *uptr)
 {
-int32_t t;
+int32 t;
 t = sim_rtcn_calb (clk_tps, TMR_CLK);                   /* calibrate clock */
 sim_activate_after (uptr, 1000000/clk_tps);             /* reactivate unit */
 tmr_poll = t;                                           /* set tmr poll */