diff --git a/typo3/sysext/core/ext_tables.sql b/typo3/sysext/core/ext_tables.sql
index 666c751412d180dc26fa0e5f3f160505ba36aea1..60f77c313fa706f1b4bb9be9d9e7514ada172017 100644
--- a/typo3/sysext/core/ext_tables.sql
+++ b/typo3/sysext/core/ext_tables.sql
@@ -619,7 +619,8 @@ CREATE TABLE sys_log (
 	KEY event (userid,event_pid),
 	KEY recuidIdx (recuid,uid),
 	KEY user_auth (type,action,tstamp),
-	KEY request (request_id)
+	KEY request (request_id),
+	KEY combined_1 (tstamp, type, userid)
 ) ENGINE=InnoDB;
 
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