diff --git a/lib/adodb/drivers/adodb-postgres64.inc.php b/lib/adodb/drivers/adodb-postgres64.inc.php
index b1d161d7ced..5cbe77ed2a5 100644
--- a/lib/adodb/drivers/adodb-postgres64.inc.php
+++ b/lib/adodb/drivers/adodb-postgres64.inc.php
@@ -138,7 +138,8 @@ class ADODB_postgres64 extends ADOConnection{
 	// get the last id - never tested
 	function pg_insert_id($tablename,$fieldname)
 	{
-		$result=pg_query($this->_connectionID, 'SELECT last_value FROM '. $tablename .'_'. $fieldname .'_seq');
+		$sequence = pg_escape_identifier($this->_connectionID, $tablename .'_'. $fieldname .'_seq');
+		$result = pg_query($this->_connectionID, 'SELECT last_value FROM '. $sequence);
 		if ($result) {
 			$arr = @pg_fetch_row($result,0);
 			pg_free_result($result);
diff --git a/lib/adodb/readme_moodle.txt b/lib/adodb/readme_moodle.txt
index e8b1ad92754..89580e01215 100644
--- a/lib/adodb/readme_moodle.txt
+++ b/lib/adodb/readme_moodle.txt
@@ -20,3 +20,7 @@ Removed:
 Added:
  * index.html - prevent directory browsing on misconfigured servers
  * readme_moodle.txt - this file ;-)
+
+Changelog:
+ * MDL-85375:
+   - Fix SQL injection in pg_insert_id() - https://github.com/ADOdb/ADOdb/commit/11107d6d6e5160b62e05dff8a3a2678cf0e3a426