diff --git a/script/RFscan/phase_scan_caqtdm.py b/script/RFscan/phase_scan_caqtdm.py
index 1e418cb..7e72487 100644
--- a/script/RFscan/phase_scan_caqtdm.py
+++ b/script/RFscan/phase_scan_caqtdm.py
@@ -46,7 +46,7 @@ def after(rec):
 
 try:
     xb = create_averager(x, nb, 0.100)
-    r = lscan(phase, xb, start, stop, step , latency=lat, after_read = after)
+    r = lscan(phase, [xb], start, stop, step , latency=lat, after_read = after)
     rf_phase = r.getPositions(0)
     energy   = [val.mean/1000.0/disp*energy0 for val in r.getReadable(0)]
     caput(station + "-RSYS:GET-ENERGY-ARRAY", to_array(energy,  'd'))