diff --git a/sanitize.py b/sanitize.py
index bd9aafb..5780661 100644
--- a/sanitize.py
+++ b/sanitize.py
@@ -36,7 +36,7 @@ def slugify(s,
             lower=True,
             spaces=False,
             only_ascii=False,
-            space_replacement="-"):
+            space_replacement="_"):
     """
     Creates a unicode slug for given string with several options.
     L and N signify letter/number.
@@ -133,4 +133,4 @@ def sanitize(title):
 
     ok = re.compile(r'[^\\/:*?"<>]')
     _title = "".join(x if ok.match(x) else "_" for x in _temp)
-    return _title
\ No newline at end of file
+    return _title