diff --git a/core/modules/taxonomy/taxonomy.module b/core/modules/taxonomy/taxonomy.module
index 7fc1578b006..09b67ecc597 100644
--- a/core/modules/taxonomy/taxonomy.module
+++ b/core/modules/taxonomy/taxonomy.module
@@ -310,7 +310,9 @@ function taxonomy_menu() {
   $items['taxonomy/term/%taxonomy_term/edit'] = array(
     'title' => 'Edit',
     'page callback' => 'drupal_get_form',
-    'page arguments' => array('taxonomy_form_term', 2),
+    // Pass a NULL argument to ensure that additional path components are not
+    // passed to taxonomy_form_term() as the vocabulary machine name argument.
+    'page arguments' => array('taxonomy_form_term', 2, NULL),
     'access callback' => 'taxonomy_term_edit_access',
     'access arguments' => array(2),
     'type' => MENU_LOCAL_TASK,
diff --git a/core/modules/taxonomy/taxonomy.test b/core/modules/taxonomy/taxonomy.test
index 23ce3482ac6..31b63942652 100644
--- a/core/modules/taxonomy/taxonomy.test
+++ b/core/modules/taxonomy/taxonomy.test
@@ -703,6 +703,10 @@ class TaxonomyTermTestCase extends TaxonomyWebTestCase {
     // Check that the term feed page is working.
     $this->drupalGet('taxonomy/term/' . $term->tid . '/feed');
 
+    // Check that the term edit page does not try to interpret additional path
+    // components as arguments for taxonomy_form_term().
+    $this->drupalGet('taxonomy/term/' . $term->tid . '/edit/' . $this->randomName());
+
     // Delete the term.
     $this->drupalPost('taxonomy/term/' . $term->tid . '/edit', array(), t('Delete'));
     $this->drupalPost(NULL, NULL, t('Delete'));