diff --git a/resources/fts_triggers.sql b/resources/fts_triggers.sql
index 996866afd7..c617a4547e 100644
--- a/resources/fts_triggers.sql
+++ b/resources/fts_triggers.sql
@@ -9,9 +9,9 @@ CREATE TEMP TRIGGER fts_db_format_deleted_trg AFTER DELETE ON main.data BEGIN
 END;
 
 CREATE TEMP TRIGGER fts_db_format_added_trg AFTER INSERT ON main.data BEGIN
-    INSERT INTO dirtied_formats(book, format) VALUES (NEW.book, NEW.format);
+    INSERT OR IGNORE INTO dirtied_formats(book, format) VALUES (NEW.book, NEW.format);
 END;
 
 CREATE TEMP TRIGGER fts_db_format_updated_trg AFTER UPDATE ON main.data BEGIN
-    INSERT INTO dirtied_formats(book, format) VALUES (NEW.book, NEW.format);
+    INSERT OR IGNORE INTO dirtied_formats(book, format) VALUES (NEW.book, NEW.format);
 END;