diff --git a/plugin/openmeetings/lib/openmeetings_plugin.class.php b/plugin/openmeetings/lib/openmeetings_plugin.class.php
index 35bf129336..9f46a791ef 100644
--- a/plugin/openmeetings/lib/openmeetings_plugin.class.php
+++ b/plugin/openmeetings/lib/openmeetings_plugin.class.php
@@ -32,10 +32,10 @@ class OpenMeetingsPlugin extends Plugin
                 moderator_pw VARCHAR(255) NOT NULL DEFAULT '',
                 record INT NOT NULL DEFAULT 0,
                 status INT NOT NULL DEFAULT 0,
-                created_at VARCHAR(255) NOT NULL,
-                closed_at VARCHAR(255) NOT NULL,
+                created_at DATETIME NOT NULL,
+                closed_at DATETIME,
                 calendar_id INT DEFAULT 0,
-                welcome_msg VARCHAR(255) NOT NULL DEFAULT '')";
+                welcome_msg TEXT NOT NULL DEFAULT '')";
         Database::query($sql);
 
         //Installing course settings