diff --git a/pelicanconf.py b/pelicanconf.py
index 58cc0e2..aee8ec0 100644
--- a/pelicanconf.py
+++ b/pelicanconf.py
@@ -53,5 +53,8 @@ MENUITEMS = [('Manifesto', '/')]
 
 DELETE_OUTPUT_DIRECTORY = True
 
+SLUG_REGEX_SUBSTITUTIONS = [
+(r'\s', '-'),]
+
 # Uncomment following line if you want document-relative URLs when developing
 #RELATIVE_URLS = True