diff --git a/html/inc/forum_db.inc b/html/inc/forum_db.inc
index f0143a8201..d794148bee 100644
--- a/html/inc/forum_db.inc
+++ b/html/inc/forum_db.inc
@@ -58,7 +58,7 @@ class BoincThread {
         $db = BoincDb::get();
         return $db->update($this, 'thread', $clause);
     }
-    static function enum($clause) {
+    static function enum($clause="") {
         $db = BoincDb::get();
         return $db->enum('thread', 'BoincThread', $clause);
     }
diff --git a/html/ops/forum_repair.php b/html/ops/forum_repair.php
index 31f20f652c..f5a06ad27f 100644
--- a/html/ops/forum_repair.php
+++ b/html/ops/forum_repair.php
@@ -4,6 +4,8 @@
 // due to bugs and DB gremlins.
 // This script repairs some of them.
 
+ini_set("memory_limit", "1024M");
+
 require_once("../inc/forum_db.inc");
 
 function update_thread_timestamps() {
@@ -36,7 +38,7 @@ function update_user_posts() {
 function update_thread_replies() {
     $threads = BoincThread::enum();
     foreach ($threads as $t) {
-        $n = BoincPost::count("thread=$t->id");
+        $n = BoincPost::count("thread=$t->id and hidden=0");
         $n--;
         if ($t->replies != $n) {
             $t->update("replies=$n");