diff --git a/database/init.sql b/database/init.sql
index 5eb80532448944f60ba986a413982b1705dc0f12..93f4069db6b6aeb9cea0b9cc6ccf58ac22560cd0 100644
--- a/database/init.sql
+++ b/database/init.sql
@@ -13,7 +13,7 @@ CREATE TABLE IF NOT EXISTS kara
   , category    INTEGER NOT NULL REFERENCES kara_category
   , song_type   INTEGER NOT NULL REFERENCES kara_type
   , language    TEXT    REFERENCES language
-  , file_path   TEXT    NOT NULL
+  , file_path   TEXT    NOT NULL UNIQUE
   , is_new      INTEGER NOT NULL
   , author_name TEXT
   , author_year INTEGER CHECK(author_year > 0)