diff --git a/mod/forum/lib.php b/mod/forum/lib.php
index 4a0e2f7dacf..14f84203193 100644
--- a/mod/forum/lib.php
+++ b/mod/forum/lib.php
@@ -4831,6 +4831,10 @@ function forum_user_can_post_discussion($forum, $currentgroup=null, $unused=-1,
     if (!has_capability($capname, $context)) {
         return false;
     }
+    
+    if ($forum->type == 'single') {
+        return false;
+    }
 
     if ($forum->type == 'eachuser') {
         if (forum_user_has_posted_discussion($forum->id, $USER->id)) {