diff --git a/modules/locale/locale.install b/modules/locale/locale.install
index a144813..43f691e 100644
--- a/modules/locale/locale.install
+++ b/modules/locale/locale.install
@@ -262,3 +255,21 @@ function locale_schema() {
 
   return $schema;
 }
+
+/**
+ * Drop textgroup support.
+ *
+ * Update assumes i18n migrated this data before the update happened. Core
+ * never used textgroups for anything, so it is not our job to find place
+ * for the data elsewhere.
+ */
+function locale_update_8000() {
+  $subquery = db_select('locales_source', 'ls')
+    ->fields('ls', array('lid'))
+    ->condition('ls.textgroup', 'default', '<>');
+  db_delete('locales_target', 'lt')
+    ->condition('lt.lid', $subquery, 'IN');
+  db_delete('locales_source')
+    ->condition('textgroup', 'default', '<>');
+  db_drop_field('locales_source', 'textgroup');
+}