diff --git a/src/projects/spades/pipeline/spades_pipeline/support.py b/src/projects/spades/pipeline/spades_pipeline/support.py
index 0d5c4e38d..341a9fd14 100644
--- a/src/projects/spades/pipeline/spades_pipeline/support.py
+++ b/src/projects/spades/pipeline/spades_pipeline/support.py
@@ -485,7 +485,7 @@ def atoi(text):
         return text
 
     def natural_keys(text):
-        return [atoi(c) for c in re.split("(\d+)", text)]
+        return [atoi(c) for c in re.split("(\\d+)", text)]
 
     latest_dir = None
     for dir_to_test in sorted(glob.glob(pattern), key=natural_keys, reverse=True):