diff --git a/src/messenger/webim/install/dbinfo.php b/src/messenger/webim/install/dbinfo.php
index b6197866..0026e364 100644
--- a/src/messenger/webim/install/dbinfo.php
+++ b/src/messenger/webim/install/dbinfo.php
@@ -59,7 +59,8 @@ $dbtables = array(
 
 	"${mysqlprefix}requestbuffer" => array(
 		"requestid" => "int NOT NULL auto_increment PRIMARY KEY",
-		"requestkey" => "varchar(128) NOT NULL",
+		// Use MD5 hashes as keys
+		"requestkey" => "char(32) NOT NULL",
 		"request" => "text NOT NULL"
 	),
 
diff --git a/src/messenger/webim/libs/classes/client_side_processor.php b/src/messenger/webim/libs/classes/client_side_processor.php
index b227a7bf..9585e685 100644
--- a/src/messenger/webim/libs/classes/client_side_processor.php
+++ b/src/messenger/webim/libs/classes/client_side_processor.php
@@ -60,7 +60,7 @@ abstract class ClientSideProcessor extends RequestProcessor {
 		$db = Database::getInstance();
 		$db->query(
 			"INSERT INTO {requestbuffer} (request, requestkey) VALUES (:request, :key)",
-			array(':request' => serialize($request), ':key' => $key)
+			array(':request' => serialize($request), ':key' => md5($key))
 		);
 	}
 
@@ -72,6 +72,9 @@ abstract class ClientSideProcessor extends RequestProcessor {
 	 */
 	protected function getRequestsFromBuffer($key) {
 		$db = Database::getInstance();
+
+		$key = md5($key);
+
 		// Get requests from database
 		$requests = $db->query(
 			"SELECT request FROM {requestbuffer} WHERE requestkey = :key",