diff --git a/script/RFscan/gun_scan1.py b/script/RFscan/gun_scan1.py
index 9592e8f..795dcd8 100644
--- a/script/RFscan/gun_scan1.py
+++ b/script/RFscan/gun_scan1.py
@@ -28,7 +28,7 @@ def after(rec):
 
 try:
     qb = create_averager(q, nb, 0.100)
-    r = lscan(phase, [q], start, stop, step, latency=lat, after_read = after)
+    r = lscan(phase, (q), start, stop, step, latency=lat, after_read = after)
     rf_phase = r.getPositions(0)
     charge   = [val.mean for val in r.getReadable(0)]
     caput("SINEG01-RSYS:GET-PHASE-ARRAY",  to_array(rf_phase,'d'))