diff --git a/scripts/maint/updateFallbackDirs.py b/scripts/maint/updateFallbackDirs.py
index 110ecda64c..094cbd8845 100755
--- a/scripts/maint/updateFallbackDirs.py
+++ b/scripts/maint/updateFallbackDirs.py
@@ -1183,6 +1183,7 @@ class Candidate(object):
       s += '\n'
     s += '*/'
     s += '\n'
+    return s
 
   # output the fallback info C string for this fallback
   # this is the text that would go after FallbackDir in a torrc