diff --git a/doc/configuration.rst b/doc/configuration.rst
index 88dbbbab102..a47e81da9d9 100644
--- a/doc/configuration.rst
+++ b/doc/configuration.rst
@@ -138,7 +138,7 @@ Example::
 
   ckan.cache_expires = 2592000
 
-Default value: ''
+Default value: 0
 
 This sets ``Cache-Control`` header's max-age value.