diff --git a/iocBoot/iocWithAsyn/st.cmd.SMC100 b/iocBoot/iocWithAsyn/st.cmd.SMC100
index fac9cf43..e931732b 100644
--- a/iocBoot/iocWithAsyn/st.cmd.SMC100
+++ b/iocBoot/iocWithAsyn/st.cmd.SMC100
@@ -9,7 +9,7 @@ asynOctetSetInputEos("serial1",0,"\r\n")
 asynOctetSetOutputEos("serial1",0,"\r\n")
 
 ### Newport SMC100 support
-# (driver port, serial port, axis num, ms mov poll, ms idle poll)
-SMC100CreateController("SMC100_1", "serial1",1, 100, 0)
+# (driver port, serial port, axis num, ms mov poll, ms idle poll, egu per step)
+SMC100CreateController("SMC100_1", "serial1",1, 100, 0, "0.00005")
 
 iocInit