diff --git a/modules/user/user.pages.inc b/modules/user/user.pages.inc
index 4c4a02971adb146c78575ac556d5c58d609f6b2b..e069f7fd73b64531e45d47eb33c1cdd9c8229cbc 100644
--- a/modules/user/user.pages.inc
+++ b/modules/user/user.pages.inc
@@ -302,13 +302,19 @@ function user_profile_form_submit($form, &$form_state) {
   // Remove unneeded values.
   form_state_values_clean($form_state);
 
+  // Before updating the account entity, keep an unchanged copy for use with
+  // user_save() later. This is necessary for modules implementing the user
+  // hooks to be able to react on changes by comparing the values of $account
+  // and $edit.
+  $account_unchanged = clone $account;
+
   entity_form_submit_build_entity('user', $account, $form, $form_state);
 
   // Populate $edit with the properties of $account, which have been edited on
   // this form by taking over all values, which appear in the form values too.
   $edit = array_intersect_key((array) $account, $form_state['values']);
 
-  user_save($account, $edit, $category);
+  user_save($account_unchanged, $edit, $category);
   $form_state['values']['uid'] = $account->uid;
 
   if ($category == 'account' && !empty($edit['pass'])) {
diff --git a/modules/user/user.test b/modules/user/user.test
index 0fa3749afaadbfadb20f326e4cb6f337d0fc90d9..cbde24b713e6f106d08a0625c996daa01211e652 100644
--- a/modules/user/user.test
+++ b/modules/user/user.test
@@ -1084,6 +1084,26 @@ class UserAdminTestCase extends DrupalWebTestCase {
     $this->drupalPost('admin/people', $edit, t('Update'));
     $account = user_load($user_c->uid, TRUE);
     $this->assertEqual($account->status, 0, 'User C blocked');
+
+    // Test unblocking of a user from /admin/people page and sending of activation mail
+    $editunblock = array();
+    $editunblock['operation'] = 'unblock';
+    $editunblock['accounts[' . $account->uid . ']'] = TRUE;
+    $this->drupalPost('admin/people', $editunblock, t('Update'));
+    $account = user_load($user_c->uid, TRUE);
+    $this->assertEqual($account->status, 1, 'User C unblocked');
+    $this->assertMail("to", $account->mail, "Activation mail sent to user C");
+
+    // Test blocking and unblocking another user from /user/[uid]/edit form and sending of activation mail
+    $user_d = $this->drupalCreateUser(array());
+    $account1 = user_load($user_d->uid, TRUE);
+    $this->drupalPost('user/' . $account1->uid . '/edit', array('status' => 0), t('Save'));
+    $account1 = user_load($user_d->uid, TRUE);
+    $this->assertEqual($account1->status, 0, 'User D blocked');
+    $this->drupalPost('user/' . $account1->uid . '/edit', array('status' => TRUE), t('Save'));
+    $account1 = user_load($user_d->uid, TRUE);
+    $this->assertEqual($account1->status, 1, 'User D unblocked');
+    $this->assertMail("to", $account1->mail, "Activation mail sent to user D");
   }
 }