diff --git a/src/administrator/components/com_weblinks/sql/updates/mysql/4.0.0.sql b/src/administrator/components/com_weblinks/sql/updates/mysql/4.0.0.sql
index f9075b9..ace1d8b 100644
--- a/src/administrator/components/com_weblinks/sql/updates/mysql/4.0.0.sql
+++ b/src/administrator/components/com_weblinks/sql/updates/mysql/4.0.0.sql
@@ -11,6 +11,10 @@ UPDATE `#__weblinks` SET `publish_up` = NULL WHERE `publish_up` = '0000-00-00 00
 UPDATE `#__weblinks` SET `publish_down` = NULL WHERE `publish_down` = '0000-00-00 00:00:00';
 UPDATE `#__weblinks` SET `checked_out_time` = NULL WHERE `checked_out_time` = '0000-00-00 00:00:00';
 
+UPDATE `#__categories` SET `modified_time` = `created_time` WHERE `modified_time` = '0000-00-00 00:00:00' AND `extension` = 'com_weblinks';
+
+UPDATE `#__categories` SET `checked_out_time` = NULL WHERE `checked_out_time` = '0000-00-00 00:00:00' AND `extension` = 'com_weblinks';
+
 UPDATE `#__ucm_content` SET `core_modified_time` = `core_created_time`
  WHERE `core_type_alias` IN ('com_weblinks.weblink', 'com_weblinks.category')
    AND `core_modified_time` = '0000-00-00 00:00:00';
diff --git a/src/administrator/components/com_weblinks/sql/updates/postgresql/4.0.0.sql b/src/administrator/components/com_weblinks/sql/updates/postgresql/4.0.0.sql
index 7fd57bf..ef14431 100644
--- a/src/administrator/components/com_weblinks/sql/updates/postgresql/4.0.0.sql
+++ b/src/administrator/components/com_weblinks/sql/updates/postgresql/4.0.0.sql
@@ -17,6 +17,10 @@ UPDATE "#__weblinks" SET "publish_up" = NULL WHERE "publish_up" = '1970-01-01 00
 UPDATE "#__weblinks" SET "publish_down" = NULL WHERE "publish_down" = '1970-01-01 00:00:00';
 UPDATE "#__weblinks" SET "checked_out_time" = NULL WHERE "checked_out_time" = '1970-01-01 00:00:00';
 
+UPDATE "#__categories" SET "modified_time" = "created_time" WHERE "modified_time" = '1970-01-01 00:00:00' AND "extension" = 'com_weblinks';
+
+UPDATE "#__categories" SET "checked_out_time" = NULL WHERE "checked_out_time" = '1970-01-01 00:00:00' AND "extension" = 'com_weblinks';
+
 UPDATE "#__ucm_content" SET "core_modified_time" = "core_created_time"
  WHERE "core_type_alias" IN ('com_weblinks.weblink', 'com_weblinks.category')
    AND "core_modified_time" = '1970-01-01 00:00:00';