diff --git a/ObservationSim/_util.py b/ObservationSim/_util.py
index ac93733816c21397d5cceb152ad7e76c587c35c7..67ac785cacd3e3d072869576cf7a5193bf936598 100755
--- a/ObservationSim/_util.py
+++ b/ObservationSim/_util.py
@@ -97,14 +97,14 @@ def make_run_dirs(work_dir, run_name, pointing_list):
         except OSError:
             pass
     prefix = "MSC_"
-    for pointing in pointing_list:
-        fname=prefix + str(pointing.id).rjust(7, '0')
-        subImgDir = os.path.join(imgDir, fname)
-        if not os.path.exists(subImgDir):
-            try:
-                os.makedirs(subImgDir, exist_ok=True)
-            except OSError:
-                pass
+    # for pointing in pointing_list:
+    #     fname=prefix + str(pointing.id).rjust(7, '0')
+    #     subImgDir = os.path.join(imgDir, fname)
+    #     if not os.path.exists(subImgDir):
+    #         try:
+    #             os.makedirs(subImgDir, exist_ok=True)
+    #         except OSError:
+    #             pass
     return imgDir
 
 def imgName(tt=0):