diff --git a/sources/i18n_string/tmgmt_i18n_string.module b/sources/i18n_string/tmgmt_i18n_string.module
index f3c7365..56b12df 100644
--- a/sources/i18n_string/tmgmt_i18n_string.module
+++ b/sources/i18n_string/tmgmt_i18n_string.module
@@ -100,7 +100,7 @@ function tmgmt_i18n_string_form_i18n_string_translate_page_overview_form_alter(&
 
   // Provide request translation UI only for supported types.
   $plugin_info = tmgmt_source_plugin_info('i18n_string');
-  if (isset($plugin_info['item types'][$object->get_type()])) {
+  if (!isset($plugin_info['item types'][$object->get_type()])) {
     return;
   }