diff --git a/00-tables.sql b/00-tables.sql
index 217ddda33cd42ad70d249988340a2715b4382fdf..9b8f755e683ebdae71138f4286e00699e562527c 100644
--- a/00-tables.sql
+++ b/00-tables.sql
@@ -156,7 +156,6 @@ CREATE TABLE collections (
     collection_id     SERIAL        NOT NULL,
     title             VARCHAR       NOT NULL,
     owner_id          VARCHAR       NOT NULL,
-    PRIMARY KEY (collection_id),
-    FOREIGN KEY (owner_id) REFERENCES users (user_id)
+    PRIMARY KEY (collection_id)
 );