diff --git a/core/modules/taxonomy/src/Plugin/migrate/source/d6/TermLocalizedTranslation.php b/core/modules/taxonomy/src/Plugin/migrate/source/d6/TermLocalizedTranslation.php
index 3153326..5348ee2 100644
--- a/core/modules/taxonomy/src/Plugin/migrate/source/d6/TermLocalizedTranslation.php
+++ b/core/modules/taxonomy/src/Plugin/migrate/source/d6/TermLocalizedTranslation.php
@@ -30,7 +30,8 @@ public function query() {
     $query->addField('td', 'language', 'td.language');
 
     // Add in the property, which is either name or description.
-    $query->leftJoin('i18n_strings', 'i18n', 'td.tid = i18n.objectid');
+    // Cast td.tid as char for PostgreSQL compatibility.
+    $query->leftJoin('i18n_strings', 'i18n', 'CAST(td.tid AS CHAR(255)) = i18n.objectid');
     $query->isNotNull('i18n.lid');
     $query->addField('i18n', 'lid');
     $query->addField('i18n', 'property');