diff --git a/script/RFscan/phase_scan_caqtdm_dv.py b/script/RFscan/phase_scan_caqtdm_dv.py
index e39d6da..2c4fae2 100644
--- a/script/RFscan/phase_scan_caqtdm_dv.py
+++ b/script/RFscan/phase_scan_caqtdm_dv.py
@@ -20,7 +20,7 @@ rf_phase_var.initialize()
 
 rf_ampl_rbk  =  Channel(prefix + ":GET-VSUM-AMPLT-SIM", type = 'd', alias='Amplitude Readback')
 rf_power_rbk =  Channel(prefix + ":GET-KLY-POWER-SIM",  type = 'd', alias='Power Readback')
-bpm_x        =  Channel(bpm_ch + ":X1",                 type = 'd', alias='BPM-X')
+bpm_x        =  Channel(bpm_ch + ":X1-SIM",                 type = 'd', alias='BPM-X')
 
 #TODO: update the plot dynamically
 def after(rec):