diff --git a/libraries/classes/Config/FormDisplay.php b/libraries/classes/Config/FormDisplay.php
index c72aa23208..bc754d44ef 100644
--- a/libraries/classes/Config/FormDisplay.php
+++ b/libraries/classes/Config/FormDisplay.php
@@ -824,7 +824,7 @@ class FormDisplay
         return MySQLDocumentation::getDocumentationLink(
             'config',
             'cfg_' . $this->_getOptName($path),
-            Sanitize::isSetup() ? '../' : ''
+            Sanitize::isSetup() ? '../' : './'
         );
     }
 
diff --git a/libraries/classes/Html/MySQLDocumentation.php b/libraries/classes/Html/MySQLDocumentation.php
index fb45c8a806..484b73ea30 100644
--- a/libraries/classes/Html/MySQLDocumentation.php
+++ b/libraries/classes/Html/MySQLDocumentation.php
@@ -82,7 +82,7 @@ class MySQLDocumentation
      *
      * @return string URL
      */
-    public static function getDocumentationLink($page, $anchor = '', string $pathPrefix = ''): string
+    public static function getDocumentationLink($page, $anchor = '', string $pathPrefix = './'): string
     {
         /* Construct base URL */
         $url = $page . '.html';
diff --git a/libraries/classes/Sanitize.php b/libraries/classes/Sanitize.php
index f8c0244ce6..e05932c8dc 100644
--- a/libraries/classes/Sanitize.php
+++ b/libraries/classes/Sanitize.php
@@ -153,7 +153,7 @@ class Sanitize
                 $page = 'setup';
             }
         }
-        $link = MySQLDocumentation::getDocumentationLink($page, $anchor, self::isSetup() ? '../' : '');
+        $link = MySQLDocumentation::getDocumentationLink($page, $anchor, self::isSetup() ? '../' : './');
 
         return '<a href="' . $link . '" target="documentation">';
     }