diff --git a/pelicanconf.py b/pelicanconf.py
index 8ba9c41..5ea608c 100644
--- a/pelicanconf.py
+++ b/pelicanconf.py
@@ -50,5 +50,7 @@ MARKDOWN = {'extensions':
 
 DISPLAY_CATEGORIES_ON_MENU = True
 
+DELETE_OUTPUT_DIRECTORY = True
+
 # Uncomment following line if you want document-relative URLs when developing
 #RELATIVE_URLS = True