diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index 0671454..e4482b3 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -441,7 +441,7 @@ function system_element_info() {
     '#input' => TRUE,
     '#size' => 60,
     '#maxlength' => 128,
-    '#process' => array('ajax_process_form'),
+    '#process' => array('ajax_process_form', 'form_process_pattern'),
     '#theme' => 'password',
     '#theme_wrappers' => array('form_element'),
   );
diff --git a/core/modules/system/tests/form.test b/core/modules/system/tests/form.test
index 5ec0434..0db2373 100644
--- a/core/modules/system/tests/form.test
+++ b/core/modules/system/tests/form.test
@@ -777,6 +777,7 @@ class FormValidationTestCase extends DrupalWebTestCase {
   function testPatternValidation() {
     $textfield_error = t('%name field is not in the right format.', array('%name' => 'One digit followed by lowercase letters'));
     $tel_error = t('%name field is not in the right format.', array('%name' => 'Everything except numbers'));
+    $password_error = t('%name field is not in the right format.', array('%name' => 'Password'));
 
     // Invalid textfield, valid tel.
     $edit = array(
@@ -786,15 +787,18 @@ class FormValidationTestCase extends DrupalWebTestCase {
     $this->drupalPost('form-test/pattern', $edit, 'Submit');
     $this->assertRaw($textfield_error);
     $this->assertNoRaw($tel_error);
+    $this->assertNoRaw($password_error);
 
-    // Valid textfield, invalid tel.
+    // Valid textfield, invalid tel, valid password.
     $edit = array(
       'textfield' => '7seven',
       'tel' => '818937',
+      'password' => '0100110',
     );
     $this->drupalPost('form-test/pattern', $edit, 'Submit');
     $this->assertNoRaw($textfield_error);
     $this->assertRaw($tel_error);
+    $this->assertNoRaw($password_error);
 
     // Non required fields are not validated if empty.
     $edit = array(
@@ -804,6 +808,16 @@ class FormValidationTestCase extends DrupalWebTestCase {
     $this->drupalPost('form-test/pattern', $edit, 'Submit');
     $this->assertNoRaw($textfield_error);
     $this->assertNoRaw($tel_error);
+    $this->assertNoRaw($password_error);
+
+    // Invalid password.
+    $edit = array(
+      'password' => $this->randomName(),
+    );
+    $this->drupalPost('form-test/password', $edit, 'Submit');
+    $this->assertNoRaw($textfield_error);
+    $this->assertNoRaw($tel_error);
+    $this->assertRaw($password_error);
 
     // The pattern attribute overrides #pattern and is not validated on the
     // server side.
diff --git a/core/modules/system/tests/modules/form_test/form_test.module b/core/modules/system/tests/modules/form_test/form_test.module
index 9e98801..7d4e3be 100644
--- a/core/modules/system/tests/modules/form_test/form_test.module
+++ b/core/modules/system/tests/modules/form_test/form_test.module
@@ -539,6 +539,11 @@ function form_test_pattern_form($form, &$form_state) {
     '#title' => 'Everything except numbers',
     '#pattern' => '[^\d]*',
   );
+  $form['password'] = array(
+    '#type' => 'password',
+    '#title' => 'Password',
+    '#pattern' => '[01]+',
+  );
   $form['url'] = array(
     '#type' => 'url',
     '#title' => 'Client side validation',