diff --git a/integrations/pgvector/src/haystack_integrations/document_stores/pgvector/document_store.py b/integrations/pgvector/src/haystack_integrations/document_stores/pgvector/document_store.py
index 9862739c5..2d6a6ede2 100644
--- a/integrations/pgvector/src/haystack_integrations/document_stores/pgvector/document_store.py
+++ b/integrations/pgvector/src/haystack_integrations/document_stores/pgvector/document_store.py
@@ -242,7 +242,7 @@ def _create_keyword_index(self):
         index_exists = bool(
             self._execute_sql(
                 "SELECT * FROM pg_indexes WHERE tablename = %s",
-                (self.table_name),
+                (self.table_name,),
                 "Could not check if keyword index exists",
             ).fetchone()
         )