diff --git a/iocBoot/iocWithAsyn/st.cmd.xps b/iocBoot/iocWithAsyn/st.cmd.xps
index 5a7076b5..fab00a63 100644
--- a/iocBoot/iocWithAsyn/st.cmd.xps
+++ b/iocBoot/iocWithAsyn/st.cmd.xps
@@ -23,6 +23,7 @@ XPSAuxConfig("XPS_AUX1", "newport-xps3", 5001, 50)
 
 # asyn port, driver name, controller index, max. axes)
 drvAsynMotorConfigure("XPS1", "motorXPS", 0, 2)
+XPSInterpose("XPS1")
 
 # card,  axis, groupName.positionerName
 XPSConfigAxis(0,0,"GROUP1.POSITIONER",1000)
diff --git a/iocBoot/iocWithMPF/st.cmd.xps b/iocBoot/iocWithMPF/st.cmd.xps
index 5a7076b5..fab00a63 100644
--- a/iocBoot/iocWithMPF/st.cmd.xps
+++ b/iocBoot/iocWithMPF/st.cmd.xps
@@ -23,6 +23,7 @@ XPSAuxConfig("XPS_AUX1", "newport-xps3", 5001, 50)
 
 # asyn port, driver name, controller index, max. axes)
 drvAsynMotorConfigure("XPS1", "motorXPS", 0, 2)
+XPSInterpose("XPS1")
 
 # card,  axis, groupName.positionerName
 XPSConfigAxis(0,0,"GROUP1.POSITIONER",1000)