diff --git a/system/dbupdate_3.4.php b/system/dbupdate_3.4.php
index c3600d250..9d89de0d1 100644
--- a/system/dbupdate_3.4.php
+++ b/system/dbupdate_3.4.php
@@ -28,6 +28,8 @@ require_once('dbupdate_3.4/example2.php');
 ...
 */
 
+require_once('dbupdate_3.4/26173_index_webservicelog.php');
+
 // *** Pruefung und hinzufuegen der neuen Attribute und Tabellen
 echo '<H2>Pruefe Tabellen und Attribute!</H2>';
 
diff --git a/system/dbupdate_3.4/26173_index_webservicelog.php b/system/dbupdate_3.4/26173_index_webservicelog.php
new file mode 100644
index 000000000..6eb2b06e8
--- /dev/null
+++ b/system/dbupdate_3.4/26173_index_webservicelog.php
@@ -0,0 +1,16 @@
+<?php
+if (! defined('DB_NAME')) exit('No direct script access allowed');
+
+// Add index to system.tbl_log
+if ($result = $db->db_query("SELECT * FROM pg_class WHERE relname='idx_webserivcelog_executetime'"))
+{
+	if ($db->db_num_rows($result) == 0)
+	{
+		$qry = "CREATE INDEX idx_webserivcelog_executetime ON system.tbl_webservicelog USING btree (execute_time)";
+
+		if (! $db->db_query($qry))
+			echo '<strong>Indizes: ' . $db->db_last_error() . '</strong><br>';
+		else
+			echo 'Index fuer system.tbl_webservicelog.execute_time hinzugefuegt';
+	}
+}