diff --git a/htdocs/admin/system/security.php b/htdocs/admin/system/security.php
index 64f08acbcc9..4c65326826e 100644
--- a/htdocs/admin/system/security.php
+++ b/htdocs/admin/system/security.php
@@ -633,7 +633,7 @@ print '<strong>MAIN_SECURITY_MAXFILESIZE_DOWNLOADED</strong> = '.getDolGlobalStr
 print '<br>';
 
 print '<strong>MAIN_RESTRICTHTML_ONLY_VALID_HTML</strong> = '.(getDolGlobalString('MAIN_RESTRICTHTML_ONLY_VALID_HTML') ? '1' : '<span class="opacitymedium">'.$langs->trans("Undefined").'</span>');
-print ' &nbsp; <span class="opacitymedium">('.$langs->trans("Recommended").": 1)</span><br>";
+print ' &nbsp; <span class="opacitymedium">('.$langs->trans("Recommended").": 0 - does not work on HTML5)</span><br>";
 print '<br>';
 
 print '<strong>MAIN_RESTRICTHTML_ONLY_VALID_HTML_TIDY</strong> = '.(getDolGlobalString('MAIN_RESTRICTHTML_ONLY_VALID_HTML_TIDY') ? '1' : '<span class="opacitymedium">'.$langs->trans("Undefined").'</span>');
diff --git a/test/phpunit/SecurityTest.php b/test/phpunit/SecurityTest.php
index 8c43f3fe577..d95d8da3454 100644
--- a/test/phpunit/SecurityTest.php
+++ b/test/phpunit/SecurityTest.php
@@ -1152,7 +1152,7 @@ class SecurityTest extends PHPUnit\Framework\TestCase
 		global $conf;
 
 		// Set options for cleaning data
-		$conf->global->MAIN_RESTRICTHTML_ONLY_VALID_HTML = 1;
+		$conf->global->MAIN_RESTRICTHTML_ONLY_VALID_HTML = 0;	// disabled, does not work on HTML5
 		// Enabled option MAIN_RESTRICTHTML_ONLY_VALID_HTML_TIDY if possible
 		if (extension_loaded('tidy') && class_exists("tidy")) {
 			$conf->global->MAIN_RESTRICTHTML_ONLY_VALID_HTML_TIDY = 1;