diff --git a/dbrepo-metadata-db/1_setup-schema.sql b/dbrepo-metadata-db/1_setup-schema.sql
index e2bde25ed6d64f69c4f8d6e897a49a672e3f9a71..99f5fe2c3b9da1cd57d30d64a16cdbd54073d7dd 100644
--- a/dbrepo-metadata-db/1_setup-schema.sql
+++ b/dbrepo-metadata-db/1_setup-schema.sql
@@ -545,7 +545,7 @@ CREATE TABLE IF NOT EXISTS `mdb_image_operators`
     documentation TEXT            NOT NULL,
     PRIMARY KEY (id),
     FOREIGN KEY (image_id) REFERENCES `mdb_images` (`id`),
-    UNIQUE (value)
+    UNIQUE (image_id, value)
 ) WITH SYSTEM VERSIONING;
 
 COMMIT;