diff --git a/entity_translation.install b/entity_translation.install
index 1dd0534..1973477 100644
--- a/entity_translation.install
+++ b/entity_translation.install
@@ -96,6 +96,52 @@ function entity_translation_install() {
 }
 
 /**
+ * Implements hook_enable().
+ */
+function entity_translation_enable() {
+  // Re-activate entity translation for content types which had used it when
+  // the module was last disabled (if any), unless these have since been altered
+  // by the user to use a different translation option.
+  $entity_translation_types = variable_get('entity_translation_disabled_content_types', array());
+  foreach ($entity_translation_types as $type) {
+    if (variable_get("language_content_type_$type", FALSE) == 0) {
+      variable_set("language_content_type_$type", ENTITY_TRANSLATION_ENABLED);
+    }
+    // We should show the warning only if we actually restored at least one
+    // content type.
+    else {
+      unset($entity_translation_types[$type]);
+    }
+  }
+  if ($entity_translation_types) {
+    drupal_set_message(t('All content types previously configured to use field translation are now using it again.'), 'warning');
+  }
+  variable_del('entity_translation_disabled_content_types');
+}
+
+/**
+ * Implements hook_disable().
+ */
+function entity_translation_disable() {
+  // Store record of which types are using entity translation, and set those
+  // types to not be translated. These content types will be reset to use entity
+  // translation again if the module is later re-enabled, unless they have been
+  // changed by the user in the meantime.
+  $entity_translation_types = array();
+  $entity_translation_type_names = array();
+  foreach (node_type_get_types() as $type => $object) {
+    if (variable_get("language_content_type_$type", FALSE) == ENTITY_TRANSLATION_ENABLED) {
+      $entity_translation_types[] = $type;
+      variable_set("language_content_type_$type", 0);
+    }
+  }
+  if ($entity_translation_types) {
+    variable_set('entity_translation_disabled_content_types', $entity_translation_types);
+    drupal_set_message(t('All content types configured to use field translation have now multilingual support disabled. This change will be reverted if the entity translation module is enabled again.'), 'warning');
+  }
+}
+
+/**
  * Implements hook_uninstall().
  */
 function entity_translation_uninstall() {
@@ -103,6 +149,7 @@ function entity_translation_uninstall() {
   variable_del('locale_field_language_fallback');
   variable_del('entity_translation_edit_form_info');
   variable_del('entity_translation_entity_types');
+  variable_del('entity_translation_disabled_content_types');
 
   foreach (node_type_get_types() as $type => $object) {
     variable_del("entity_translation_node_metadata_$type");