diff --git a/fda-metadata-db/setup-schema.sql b/fda-metadata-db/setup-schema.sql
index c3806d31d27f01c55f3d1f80b5c70a7c080f291d..08ad85b36a40651769ccaf296d200b8cb070ad1b 100644
--- a/fda-metadata-db/setup-schema.sql
+++ b/fda-metadata-db/setup-schema.sql
@@ -353,7 +353,7 @@ CREATE TABLE IF NOT EXISTS mdb_columns_concepts
     URI     TEXT REFERENCES mdb_concepts (URI),
     created timestamp without time zone NOT NULL DEFAULT NOW(),
     FOREIGN KEY (cDBID, tID, cID) REFERENCES mdb_COLUMNS (cDBID, tID, ID),
-    PRIMARY KEY (cDBID, tID, cID, URI)
+    PRIMARY KEY (cDBID, tID, cID)
 );
 
 CREATE TABLE IF NOT EXISTS mdb_VIEW