diff --git a/lib/db/mysql.php b/lib/db/mysql.php
index 39ee8fc3b23..799db2b5ba6 100644
--- a/lib/db/mysql.php
+++ b/lib/db/mysql.php
@@ -1780,10 +1780,10 @@ function main_upgrade($oldversion=0) {
         table_column('course_modules','','visibleold','integer','1','unsigned','1','not null', 'visible');
     }
     
-    if ($oldversion < 2006041800) { // forgot auto_increments for ids
-        modify_database('',"ALTER TABLE post CHANGE id id INT UNSIGNED NOT NULL AUTO_INCREMENT");
-        modify_database('',"ALTER TABLE tags CHANGE id id INT UNSIGNED NOT NULL AUTO_INCREMENT");
-        modify_database('',"ALTER TABLE blog_tag_instance CHANGE id id INT UNSIGNED NOT NULL AUTO_INCREMENT");
+    if ($oldversion < 2006041801) { // forgot auto_increments for ids
+        modify_database('',"ALTER TABLE prefix_post CHANGE id id INT UNSIGNED NOT NULL AUTO_INCREMENT");
+        modify_database('',"ALTER TABLE prefix_tags CHANGE id id INT UNSIGNED NOT NULL AUTO_INCREMENT");
+        modify_database('',"ALTER TABLE prefix_blog_tag_instance CHANGE id id INT UNSIGNED NOT NULL AUTO_INCREMENT");
     }
     
     return $result;
diff --git a/version.php b/version.php
index 5e7db38a099..ef5e6859a07 100644
--- a/version.php
+++ b/version.php
@@ -6,7 +6,7 @@
 // This is compared against the values stored in the database to determine
 // whether upgrades should be performed (see lib/db/*.php)
 
-   $version = 2006041800;  // YYYYMMDD = date
+   $version = 2006041801;  // YYYYMMDD = date
                            //       XY = increments within a single day
 
    $release = '1.6 Beta 3';    // Human-friendly version name