diff --git a/lib/dml/mssql_adodb_moodle_database.php b/lib/dml/mssql_adodb_moodle_database.php
index 4fde207bbe7..6bb96da6267 100644
--- a/lib/dml/mssql_adodb_moodle_database.php
+++ b/lib/dml/mssql_adodb_moodle_database.php
@@ -130,7 +130,7 @@ class mssql_adodb_moodle_database extends adodb_moodle_database {
     /**
      * Returns the SQL for returning searching one string for the location of another.
      */
-    public function sql_substr($needle, $haystack) {
+    public function sql_position($needle, $haystack) {
         // Implementation using standard SQL.
         return "CHARINDEX(($needle), ($haystack))";
     }
diff --git a/lib/dml/oci8po_adodb_moodle_database.php b/lib/dml/oci8po_adodb_moodle_database.php
index bdcf2007f1b..02a1a71876e 100644
--- a/lib/dml/oci8po_adodb_moodle_database.php
+++ b/lib/dml/oci8po_adodb_moodle_database.php
@@ -185,7 +185,7 @@ class oci8po_adodb_moodle_database extends adodb_moodle_database {
     /**
      * Returns the SQL for returning searching one string for the location of another.
      */
-    public function sql_substr($needle, $haystack) {
+    public function sql_position($needle, $haystack) {
         // Implementation using standard SQL.
         return "INSTR(($haystack), ($needle))";
     }