diff --git a/login/index_form.html b/login/index_form.html
index bfed5054f76..c1ff0404ed0 100644
--- a/login/index_form.html
+++ b/login/index_form.html
@@ -26,7 +26,7 @@ if ($show_instructions) {
               echo '</div>';
           }
         ?>
-        <form action="index.php" method="post" id="login">
+        <form action="<?php echo $CFG->httpswwwroot; ?>/login/index.php" method="post" id="login">
           <div class="loginform">
             <div class="form-label"><label for="username"><?php print_string("username") ?></label></div>
             <div class="form-input">