diff --git a/script/RFscan/phase_scan_caqtdm_dv2.py b/script/RFscan/phase_scan_caqtdm_dv2.py
index bba9408..0bd29e0 100644
--- a/script/RFscan/phase_scan_caqtdm_dv2.py
+++ b/script/RFscan/phase_scan_caqtdm_dv2.py
@@ -3,12 +3,10 @@ import  ch.psi.pshell.epics.ControlledVariable as ControlledVariable
 latency = 0.05
 
 if get_exec_pars().source == CommandSource.ui:
-    prefix = "SINSB04"
+    prefix = "SINSB04-RSYS"
 else:
-    prefix = args[0]
+    prefix = args[0] + "-RSYS"
 
-prefix += "-RSYS" 
-print "Prefix = ", prefix
 
 start   = caget(prefix + ":SET-SCAN-START")
 stop    = caget(prefix + ":SET-SCAN-STOP")