diff --git a/hydradx/model/processing.py b/hydradx/model/processing.py
index 0ffd0950..ded49f0d 100644
--- a/hydradx/model/processing.py
+++ b/hydradx/model/processing.py
@@ -863,6 +863,7 @@ def find_data_files():
             os.listdir('.')
         ))
     file_ls = find_data_files()
+    file_ls.sort()
     file_name = ''
     # see if the date or block they want is included in existing data
     with open(file_ls[-1]) as f: