diff --git a/src/pacman/lib/util.py b/src/pacman/lib/util.py
index da992b9..e7a2003 100644
--- a/src/pacman/lib/util.py
+++ b/src/pacman/lib/util.py
@@ -569,7 +569,11 @@ def read_fitfiles(meta):
         if meta.s30_most_recent_s20:
             lst_dir = os.listdir(meta.workdir + "/extracted_lc/")
             lst_dir = sn(lst_dir)
-            white_dir = lst_dir[-1]
+            # the following line makes sure that only directories starting with a "2" are considered
+            # this was implemented after issue #10 was raised (see issue for more info)
+            # this works because the dates will always start with a "2"
+            lst_dir_new = [lst_dir_i for lst_dir_i in lst_dir if lst_dir_i.startswith("2")]
+            white_dir = lst_dir_new[-1]
             files.append(meta.workdir + "/extracted_lc/" + white_dir + "/lc_white.txt")
             print('using most recent s20 run: {0}'.format(white_dir))
         else:
diff --git a/src/pacman/s21_bin_spectroscopic_lc.py b/src/pacman/s21_bin_spectroscopic_lc.py
index aaaed47..92ab621 100644
--- a/src/pacman/s21_bin_spectroscopic_lc.py
+++ b/src/pacman/s21_bin_spectroscopic_lc.py
@@ -45,7 +45,11 @@ def weighted_mean(data, err):				#calculates the weighted mean for data points d
     if meta.s21_most_recent_s20:
         lst_dir = os.listdir(meta.workdir + "/extracted_lc/")
         lst_dir = sn.sort_nicely(lst_dir)
-        spec_dir = lst_dir[-1]
+        # the following line makes sure that only directories starting with a "2" are considered
+        # this was implemented after issue #10 was raised (see issue for more info)
+        # this works because the dates will always start with a "2"
+        lst_dir_new = [lst_dir_i for lst_dir_i in lst_dir if lst_dir_i.startswith("2")]
+        spec_dir = lst_dir_new[-1]
     else:
         spec_dir = meta.s21_spec_dir_path_s20