diff --git a/config/sync/core.extension.yml b/config/sync/core.extension.yml
index 42bbff1..42fcb79 100644
--- a/config/sync/core.extension.yml
+++ b/config/sync/core.extension.yml
@@ -32,6 +32,7 @@ module:
   contact: 0
   contextual: 0
   ctools: 0
+  customerror: 0
   datetime: 0
   datetime_range: 0
   dblog: 0
diff --git a/config/sync/system.site.yml b/config/sync/system.site.yml
index f58b990..67a785a 100644
--- a/config/sync/system.site.yml
+++ b/config/sync/system.site.yml
@@ -3,8 +3,8 @@ name: Agaric
 mail: ask@agaric.com
 slogan: 'Building the open web'
 page:
-  403: ''
-  404: ''
+  403: /customerror/403
+  404: /customerror/404
   front: /node/1
 admin_compact_mode: false
 weight_select_max: 100