diff --git a/scripts/projects.py b/scripts/projects.py
index 3c200692..65fe6662 100644
--- a/scripts/projects.py
+++ b/scripts/projects.py
@@ -155,7 +155,7 @@ class Projects(object):
         name = re.sub('-.*', '', os)
         series = os
         while True:
-            n = re.sub('\.[0-9]+$', '', series)
+            n = re.sub(r'\.[0-9]+$', '', series)
             if n == series:
                 break
             r.append(n)