diff --git a/admin/tool/brickfield/classes/local/htmlchecker/common/checks/img_alt_is_too_long.php b/admin/tool/brickfield/classes/local/htmlchecker/common/checks/img_alt_is_too_long.php
index 7963e14947b..21e2c2ce4b5 100644
--- a/admin/tool/brickfield/classes/local/htmlchecker/common/checks/img_alt_is_too_long.php
+++ b/admin/tool/brickfield/classes/local/htmlchecker/common/checks/img_alt_is_too_long.php
@@ -30,10 +30,6 @@ use tool_brickfield\local\htmlchecker\common\brickfield_accessibility_test;
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 class img_alt_is_too_long extends brickfield_accessibility_test {
-
-    /** @var int The default severity code for this test. */
-    public $defaultseverity = \tool_brickfield\local\htmlchecker\brickfield_accessibility::BA_TEST_SEVERE;
-
     /**
      * The main check function. This is called by the parent class to actually check content.
      */
@@ -41,7 +37,7 @@ class img_alt_is_too_long extends brickfield_accessibility_test {
         global $alttextlengthlimit;
 
         foreach ($this->get_all_elements('img') as $img) {
-            $alttextlengthlimit = 125;
+            $alttextlengthlimit = 750;
             if ($img->hasAttribute('alt') && core_text::strlen($img->getAttribute('alt')) > $alttextlengthlimit) {
                 $this->add_report($img);
             }
diff --git a/admin/tool/brickfield/lang/en/tool_brickfield.php b/admin/tool/brickfield/lang/en/tool_brickfield.php
index ed0e4f27410..972427377b0 100644
--- a/admin/tool/brickfield/lang/en/tool_brickfield.php
+++ b/admin/tool/brickfield/lang/en/tool_brickfield.php
@@ -179,7 +179,7 @@ $string['checkdesc:headerh3'] = 'Headers following after H3 headers (the editor
 $string['checkdesc:headershavetext'] = 'A header needs to contain text to be perceivable.';
 $string['checkdesc:iisnotused'] = 'Italic (i) elements should not be used; "em" should be used instead.';
 $string['checkdesc:imgaltisdifferent'] = 'Image alt (alternative) text should not be the image filename.';
-$string['checkdesc:imgaltistoolong'] = 'Image alt (alternative) text should not be more than the maximum allowed (125) characters.';
+$string['checkdesc:imgaltistoolong'] = 'Ensure that the image alt (alternative) text is concise enough to describe the image.';
 $string['checkdesc:imgaltnotemptyinanchor'] = 'Image alt (alternative) text should not be empty, especially when the image has a link going elsewhere.';
 $string['checkdesc:imgaltnotplaceholder'] = 'Image alt (alternative) text should not be a simple placeholder text, such as "image".';
 $string['checkdesc:imghasalt'] = 'Image alt (alternative) text should not be missing for image elements, unless purely decorative with no meaning.';
diff --git a/admin/tool/brickfield/tests/local/htmlchecker/common/checks/img_alt_is_too_long_test.php b/admin/tool/brickfield/tests/local/htmlchecker/common/checks/img_alt_is_too_long_test.php
index c2472cb37f9..74e17d46681 100644
--- a/admin/tool/brickfield/tests/local/htmlchecker/common/checks/img_alt_is_too_long_test.php
+++ b/admin/tool/brickfield/tests/local/htmlchecker/common/checks/img_alt_is_too_long_test.php
@@ -24,6 +24,8 @@
 
 namespace tool_brickfield\local\htmlchecker\common\checks;
 
+use tool_brickfield\local\htmlchecker\brickfield_accessibility;
+
 defined('MOODLE_INTERNAL') || die();
 
 require_once('all_checks.php');
@@ -64,21 +66,21 @@ EOD;
      */
     public static function img_alt_text_provider(): array {
         return [
-            'Alt text <= 125 characters' => [
+            'Alt text <= 750 characters' => [
                 true,
-                str_repeat("Hello world!", 10),
+                str_repeat("Hello world!", 60),
             ],
-            'Alt text > 125 characters' => [
+            'Alt text > 750 characters' => [
                 false,
-                str_repeat("Hello world!", 25),
+                str_repeat("Hello world!", 65),
             ],
-            'Multi-byte alt text <= 125 characters' => [
+            'Multi-byte alt text <= 750 characters' => [
                 true,
-                str_repeat('こんにちは、世界！', 13),
+                str_repeat('こんにちは、世界！', 83),
             ],
-            'Multi-byte alt text > 125 characters' => [
+            'Multi-byte alt text > 750 characters' => [
                 false,
-                str_repeat('こんにちは、世界！', 30),
+                str_repeat('こんにちは、世界！', 90),
             ],
         ];
     }
@@ -96,7 +98,18 @@ EOD;
         if ($expectedpass) {
             $this->assertEmpty($results);
         } else {
-            $this->assertTrue($results[0]->element->tagName === 'img');
+            $this->assertEquals('img', $results[0]->element->tagName);
         }
     }
+
+    /**
+     * Test the severity of the {@see img_alt_is_too_long} check.
+     *
+     * @return void
+     */
+    public function test_severity(): void {
+        $html = $this->get_test_html('Some alt text');
+        $checker = new brickfield_accessibility($html, 'brickfield', 'string');
+        $this->assertEquals(brickfield_accessibility::BA_TEST_SUGGESTION, $checker->get_test_severity(img_alt_is_too_long::class));
+    }
 }