diff --git a/src/drv/old/drvOms.c b/src/drv/old/drvOms.c
index ea9a08439..2910e1e67 100644
--- a/src/drv/old/drvOms.c
+++ b/src/drv/old/drvOms.c
@@ -82,6 +82,9 @@
 #include	<rngLib.h>             /* library for ring buffer support */
 #include	<semLib.h>
 #include        <vme.h>                /* library to support sysBusToLocalAdrs. */
+#include	<iv.h>
+#include	<logLib.h>
+#include	<string.h>
 
 #include	<dbDefs.h>
 #include	<epicsPrint.h>
@@ -418,7 +421,7 @@ int oms_driver_init(){
 
 			/* interrupt vector */
 			pmotor->vector = 0x80+i;
-			intConnect(((0x80+i)*4),oms_intr,i);
+			intConnect(INUM_TO_IVEC(0x80+i),oms_intr,i);
                         sysIntEnable(OMS_INT_LEV);
 
 			/* enable interrupt on input buffer full */