diff --git a/user/sumlab_auto.py b/user/sumlab_auto.py
index 9fb36849c0a781a1fa3bd6c68ebf5b3a3ec8ae81..37f590bc7eef4c96a3b0e452732f2476fcc377aa 100644
--- a/user/sumlab_auto.py
+++ b/user/sumlab_auto.py
@@ -67,7 +67,8 @@ print("\033[95m\n=======================================")
 print("   PeakOTron")
 print("=======================================\033[0m")
 
-# Loop thorough files
+# Loop thorough SORTED files in alphabetical order!
+files_to_fit = sorted(files_to_fit, key=lambda x: x[0])
 for i, (file, path) in enumerate(files_to_fit):
     print("Fitting: \033[95m{:s}\033[0m".format(file))
     V = float(file.split('deg')[1].split('V')[0].replace('_', '.'))