diff --git a/lang/en/deprecated.txt b/lang/en/deprecated.txt
index f5887d5ad12..2bd4d58cbc7 100644
--- a/lang/en/deprecated.txt
+++ b/lang/en/deprecated.txt
@@ -122,3 +122,4 @@ availablelicenses,core_admin
 managelicenses,core_admin
 userfilterplaceholder,core
 sitebackpackverify,core_badges
+filetypesnotwhitelisted,core_form
diff --git a/lang/en/form.php b/lang/en/form.php
index 165f367c9f7..4014ba243c9 100644
--- a/lang/en/form.php
+++ b/lang/en/form.php
@@ -46,7 +46,7 @@ $string['err_wrongfileextension'] = 'Some files ({$a->wrongfiles}) cannot be upl
 $string['filesofthesetypes'] = 'Accepted file types:';
 $string['filetypesany'] = 'All file types';
 $string['filetypesnotall'] = 'It is not allowed to select \'All file types\' here';
-$string['filetypesnotwhitelisted'] = 'These file types are not allowed here: {$a}';
+$string['filetypesnotallowed'] = 'These file types are not allowed here: {$a}';
 $string['filetypesothers'] = 'Other files';
 $string['filetypesunknown'] = 'Unknown file types: {$a}';
 $string['general'] = 'General';
@@ -85,3 +85,6 @@ $string['timeunit'] = 'Time unit';
 $string['timing'] = 'Timing';
 $string['unmaskpassword'] = 'Unmask';
 $string['year'] = 'Year';
+
+// Deprecated since Moodle 3.10.
+$string['filetypesnotwhitelisted'] = 'These file types are not allowed here: {$a}';
diff --git a/lib/adminlib.php b/lib/adminlib.php
index 3a7045d3880..2e6eaf51839 100644
--- a/lib/adminlib.php
+++ b/lib/adminlib.php
@@ -11276,7 +11276,7 @@ class admin_setting_filetypes extends admin_setting_configtext {
 
         } else {
             $troublemakers = $this->util->get_not_whitelisted($data, $this->onlytypes);
-            return get_string('filetypesnotwhitelisted', 'core_form', implode(' ', $troublemakers));
+            return get_string('filetypesnotallowed', 'core_form', implode(' ', $troublemakers));
         }
     }
 
diff --git a/lib/form/filetypes.php b/lib/form/filetypes.php
index 9c70b5a8ff5..3068704086f 100644
--- a/lib/form/filetypes.php
+++ b/lib/form/filetypes.php
@@ -245,7 +245,7 @@ class MoodleQuickForm_filetypes extends MoodleQuickForm_group {
             $notwhitelisted = $this->util->get_not_whitelisted($value['filetypes'], $this->onlytypes);
 
             if ($notwhitelisted) {
-                return get_string('filetypesnotwhitelisted', 'core_form', implode(', ', $notwhitelisted));
+                return get_string('filetypesnotallowed', 'core_form', implode(', ', $notwhitelisted));
             }
         }