diff --git a/csst/msc/pipeline.py b/csst/msc/pipeline.py
index d107849ea7db6cce140ebaa078049e520cc9ba6b..e42bb65c343806066f6cd4407a2b0c62941597f3 100644
--- a/csst/msc/pipeline.py
+++ b/csst/msc/pipeline.py
@@ -113,7 +113,7 @@ def do_one_exposure(ver_sim="C5.1", dir_l0="", dir_l1="", dir_pcref="", path_aux
     else:
         print(ccd_ids)
         for this_ccd_id in ccd_ids:
-            print(type(this_ccd_id),this_ccd_ids)
+            print(type(this_ccd_id),this_ccd_id)
             fp_img = dm.l1_sci(ccd_id=this_ccd_id, suffix="img",ext="fits")
             fp_wht = dm.l1_sci(ccd_id=this_ccd_id, suffix="wht",ext="fits")
             fp_flg = dm.l1_sci(ccd_id=this_ccd_id, suffix="flg",ext="fits")