diff --git a/VAX/vax750_stddev.c b/VAX/vax750_stddev.c
index cb15d13c..a307458a 100644
--- a/VAX/vax750_stddev.c
+++ b/VAX/vax750_stddev.c
@@ -777,7 +777,7 @@ 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 */