diff --git a/modules/color/color.module b/modules/color/color.module
index 924099a6a65b0aba5aa29ad9c286e9c86038a426..14410aa50c848fcb1e30f349db4a73c4bcd6599a 100644
--- a/modules/color/color.module
+++ b/modules/color/color.module
@@ -293,8 +293,7 @@ function color_scheme_form_submit($form, &$form_state) {
   }
 
   // Don't render the default colorscheme, use the standard theme instead.
-  if (implode(',', color_get_palette($theme, TRUE)) == implode(',', $palette)
-    || $form_state['values']['op'] == t('Reset to defaults')) {
+  if (implode(',', color_get_palette($theme, TRUE)) == implode(',', $palette)) {
     variable_del('color_' . $theme . '_palette');
     variable_del('color_' . $theme . '_stylesheets');
     variable_del('color_' . $theme . '_logo');
diff --git a/modules/node/content_types.inc b/modules/node/content_types.inc
index b1f5c06861664a9533583779e9db8e67824f7a26..934ef0dd8aa4e4e3d86c5a194633cca445ba7fb2 100644
--- a/modules/node/content_types.inc
+++ b/modules/node/content_types.inc
@@ -229,13 +229,6 @@ function node_type_form(&$form_state, $type = NULL) {
       );
     }
   }
-  else {
-    $form['reset'] = array(
-      '#type' => 'submit',
-      '#value' => t('Reset to defaults'),
-      '#weight' => 50,
-    );
-  }
 
   return $form;
 }
@@ -310,10 +303,7 @@ function node_type_form_submit($form, &$form_state) {
   $type->modified = TRUE;
   $type->locked = $form_state['values']['locked'];
 
-  if ($op == t('Reset to defaults')) {
-    node_type_reset($type);
-  }
-  elseif ($op == t('Delete content type')) {
+  if ($op == t('Delete content type')) {
     $form_state['redirect'] = 'admin/build/node-type/' . str_replace('_', '-', $type->old_type) . '/delete';
     return;
   }
@@ -337,29 +327,19 @@ function node_type_form_submit($form, &$form_state) {
     $variable_new = $key . '_' . $type->type;
     $variable_old = $key . '_' . $type->old_type;
 
-    if ($op == t('Reset to defaults')) {
-      variable_del($variable_old);
+    if (is_array($value)) {
+      $value = array_keys(array_filter($value));
     }
-    else {
-      if (is_array($value)) {
-        $value = array_keys(array_filter($value));
-      }
-      variable_set($variable_new, $value);
+    variable_set($variable_new, $value);
 
-      if ($variable_new != $variable_old) {
-        variable_del($variable_old);
-      }
+    if ($variable_new != $variable_old) {
+      variable_del($variable_old);
     }
   }
 
   node_types_rebuild();
   $t_args = array('%name' => $type->name);
 
-  if ($op == t('Reset to defaults')) {
-    drupal_set_message(t('The content type %name has been reset to its default values.', $t_args));
-    return;
-  }
-
   if ($status == SAVED_UPDATED) {
     drupal_set_message(t('The content type %name has been updated.', $t_args));
   }
diff --git a/modules/system/system.admin.inc b/modules/system/system.admin.inc
index 4bb1129bdb1004a2da0a7b8d9f411b078a7bf53d..6ac8d2fe8cbd434c264972e444161ef45c06c63e 100644
--- a/modules/system/system.admin.inc
+++ b/modules/system/system.admin.inc
@@ -227,10 +227,6 @@ function system_themes_form() {
     '#type' => 'submit',
     '#value' => t('Save configuration'),
   );
-  $form['buttons']['reset'] = array(
-    '#type' => 'submit',
-    '#value' => t('Reset to defaults'),
-  );
 
   return $form;
 }
@@ -513,16 +509,10 @@ function system_theme_settings_submit($form, &$form_state) {
   $values = $form_state['values'];
   $key = $values['var'];
 
-  if ($values['op'] == t('Reset to defaults')) {
-    variable_del($key);
-    drupal_set_message(t('The configuration options have been reset to their default values.'));
-  }
-  else {
-    // Exclude unnecessary elements before saving.
-    unset($values['var'], $values['submit'], $values['reset'], $values['form_id'], $values['op'], $values['form_build_id'], $values['form_token']);
-    variable_set($key, $values);
-    drupal_set_message(t('The configuration options have been saved.'));
-  }
+  // Exclude unnecessary elements before saving.
+  unset($values['var'], $values['submit'], $values['reset'], $values['form_id'], $values['op'], $values['form_build_id'], $values['form_token']);
+  variable_set($key, $values);
+  drupal_set_message(t('The configuration options have been saved.'));
 
   cache_clear_all();
 }
diff --git a/modules/system/system.module b/modules/system/system.module
index e05e27e5d11792ac6422a6eaa2667dd56f657f8a..ccfce53703c10bcf6d0703aa7c2a6c418c0a802a 100644
--- a/modules/system/system.module
+++ b/modules/system/system.module
@@ -2033,7 +2033,6 @@ function _system_settings_form_automatic_defaults($form) {
  */
 function system_settings_form($form, $automatic_defaults = TRUE) {
   $form['buttons']['submit'] = array('#type' => 'submit', '#value' => t('Save configuration') );
-  $form['buttons']['reset'] = array('#type' => 'submit', '#value' => t('Reset to defaults') );
 
   if ($automatic_defaults) {
     $form = _system_settings_form_automatic_defaults($form);
@@ -2060,23 +2059,14 @@ function system_settings_form_submit($form, &$form_state) {
   unset($form_state['values']['submit'], $form_state['values']['reset'], $form_state['values']['form_id'], $form_state['values']['op'], $form_state['values']['form_token'], $form_state['values']['form_build_id']);
 
   foreach ($form_state['values'] as $key => $value) {
-    if ($op == t('Reset to defaults')) {
-      variable_del($key);
+    if (is_array($value) && isset($form_state['values']['array_filter'])) {
+      $value = array_keys(array_filter($value));
     }
-    else {
-      if (is_array($value) && isset($form_state['values']['array_filter'])) {
-        $value = array_keys(array_filter($value));
-      }
-      variable_set($key, $value);
-    }
-  }
-  if ($op == t('Reset to defaults')) {
-    drupal_set_message(t('The configuration options have been reset to their default values.'));
-  }
-  else {
-    drupal_set_message(t('The configuration options have been saved.'));
+    variable_set($key, $value);
   }
 
+  drupal_set_message(t('The configuration options have been saved.'));
+
   cache_clear_all();
   drupal_theme_rebuild();
 }
diff --git a/modules/system/system.test b/modules/system/system.test
index 78f5634a7cc4a908573585803afc34ae8adb0d57..4d40465eff4087fbf642129a9e9ac1533c9056b4 100644
--- a/modules/system/system.test
+++ b/modules/system/system.test
@@ -539,7 +539,7 @@ class AccessDeniedTestCase extends DrupalWebTestCase {
 
     // Log back in and remove the custom 403 page.
     $this->drupalLogin($this->admin_user);
-    $this->drupalPost('admin/settings/site-information', array(), t('Reset to defaults'));
+    $this->drupalPost('admin/settings/site-information', array('site_403' => ''), t('Save configuration'));
 
     // Logout and check that the user login block is shown on default 403 pages.
     $this->drupalLogout();
@@ -600,7 +600,7 @@ class PageNotFoundTestCase extends DrupalWebTestCase {
 
     // Log back in and remove the custom 404 page.
     $this->drupalLogin($this->admin_user);
-    $this->drupalPost('admin/settings/site-information', array(), t('Reset to defaults'));
+    $this->drupalPost('admin/settings/site-information', array('site_404' => ''), t('Save configuration'));
 
     // Logout and check that the user login block is not shown on default 404 pages.
     $this->drupalLogout();
@@ -961,7 +961,12 @@ class SystemThemeFunctionalTest extends DrupalWebTestCase {
     $this->assertRaw('themes/stark', t('Site default theme used on the add content page.'));
 
     // Reset to the default theme settings.
-    $this->drupalPost('admin/build/themes', array(), t('Reset to defaults'));
+    $edit = array(
+      'theme_default' => 'garland',
+      'admin_theme' => '0',
+      'node_admin_theme' => FALSE,
+    );
+    $this->drupalPost('admin/build/themes', $edit, t('Save configuration'));
 
     $this->drupalGet('admin');
     $this->assertRaw('themes/garland', t('Site default theme used on administration page.'));
diff --git a/modules/update/update.settings.inc b/modules/update/update.settings.inc
index e67f6ba7f0e50e86c82a7adb20c89ef92915108f..3bb05a38fe5661b3423bb0be0047ca814bf4e2b0 100644
--- a/modules/update/update.settings.inc
+++ b/modules/update/update.settings.inc
@@ -91,18 +91,14 @@ function update_settings_validate($form, &$form_state) {
 function update_settings_submit($form, $form_state) {
   $op = $form_state['values']['op'];
 
-  if ($op == t('Reset to defaults')) {
-    unset($form_state['notify_emails']);
+  if (empty($form_state['notify_emails'])) {
+    variable_del('update_notify_emails');
   }
   else {
-    if (empty($form_state['notify_emails'])) {
-      variable_del('update_notify_emails');
-    }
-    else {
-      variable_set('update_notify_emails', $form_state['notify_emails']);
-    }
-    unset($form_state['notify_emails']);
-    unset($form_state['values']['update_notify_emails']);
+    variable_set('update_notify_emails', $form_state['notify_emails']);
   }
+  unset($form_state['notify_emails']);
+  unset($form_state['values']['update_notify_emails']);
+
   system_settings_form_submit($form, $form_state);
 }