diff --git a/postgres/postgres.go b/postgres/postgres.go
index bb88a6bb..b44ac67a 100644
--- a/postgres/postgres.go
+++ b/postgres/postgres.go
@@ -98,7 +98,7 @@ func New(config ...Config) *Storage {
 		db:         db,
 		gcInterval: cfg.GCInterval,
 		sqlSelect:  fmt.Sprintf(`SELECT v, e FROM %s WHERE k=$1;`, cfg.Table),
-		sqlInsert:  fmt.Sprintf("INSERT INTO %s (k, v, e) VALUES ($1, $2, $3) ON CONFLICT (id) DO UPDATE SET v = $4, e = $5", cfg.Table),
+		sqlInsert:  fmt.Sprintf("INSERT INTO %s (k, v, e) VALUES ($1, $2, $3) ON CONFLICT (k) DO UPDATE SET v = $4, e = $5", cfg.Table),
 		sqlDelete:  fmt.Sprintf("DELETE FROM %s WHERE k=$1", cfg.Table),
 		sqlClear:   fmt.Sprintf("DELETE FROM %s;", cfg.Table),
 		sqlGC:      fmt.Sprintf("DELETE FROM %s WHERE e <= $1", cfg.Table),