diff --git a/htdocs/interaction/forum/lib.php b/htdocs/interaction/forum/lib.php
index 09fcf6f00c1f3906b67a8e53370876e401e999d0..b742488acb1cd7e7e3c111483f54ea3f0ded6685 100644
--- a/htdocs/interaction/forum/lib.php
+++ b/htdocs/interaction/forum/lib.php
@@ -324,6 +324,13 @@ EOF;
         db_commit();
     }
 
+    public static function postinst($prevversion) {
+        // On a new installation, set post delay to 30 minutes
+        if ($prevversion == 0) {
+            set_config_plugin('interaction', 'forum', 'postdelay', 30);
+        }
+    }
+
     public static function get_activity_types() {
         return array(
             (object)array(