diff --git a/admin/tool/log/store/standard/db/install.xml b/admin/tool/log/store/standard/db/install.xml
index 9586c034b66..22d80d4e06e 100644
--- a/admin/tool/log/store/standard/db/install.xml
+++ b/admin/tool/log/store/standard/db/install.xml
@@ -30,6 +30,7 @@
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
+        <KEY NAME="contextid" TYPE="foreign" FIELDS="contextid" REFTABLE="context" REFFIELDS="id"/>
       </KEYS>
       <INDEXES>
         <INDEX NAME="timecreated" UNIQUE="false" FIELDS="timecreated"/>
diff --git a/admin/tool/log/store/standard/db/upgrade.php b/admin/tool/log/store/standard/db/upgrade.php
index 9b4247b9a4a..fc3b1bfcb12 100644
--- a/admin/tool/log/store/standard/db/upgrade.php
+++ b/admin/tool/log/store/standard/db/upgrade.php
@@ -123,5 +123,20 @@ function xmldb_logstore_standard_upgrade($oldversion) {
     // Moodle v3.0.0 release upgrade line.
     // Put any upgrade step following this.
 
+    if ($oldversion < 2015111601) {
+        // This could take a long time. Unfortunately, no way to know how long, and no way to do progress, so setting for 1 hour.
+        upgrade_set_timeout(3600);
+
+        // Define key contextid (foreign) to be added to logstore_standard_log.
+        $table = new xmldb_table('logstore_standard_log');
+        $key = new xmldb_key('contextid', XMLDB_KEY_FOREIGN, array('contextid'), 'context', array('id'));
+
+        // Launch add key contextid.
+        $dbman->add_key($table, $key);
+
+        // Standard savepoint reached.
+        upgrade_plugin_savepoint(true, 2015111601, 'logstore', 'standard');
+    }
+
     return true;
 }
diff --git a/admin/tool/log/store/standard/version.php b/admin/tool/log/store/standard/version.php
index 73c131e551e..e5cdc97a3a2 100644
--- a/admin/tool/log/store/standard/version.php
+++ b/admin/tool/log/store/standard/version.php
@@ -24,6 +24,6 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$plugin->version = 2015111600; // The current plugin version (Date: YYYYMMDDXX).
+$plugin->version = 2015111601; // The current plugin version (Date: YYYYMMDDXX).
 $plugin->requires = 2015111000; // Requires this Moodle version.
 $plugin->component = 'logstore_standard'; // Full name of the plugin (used for diagnostics).