diff --git a/src/korma/sql/engine.clj b/src/korma/sql/engine.clj
index 86c2eb9..ec1c2c9 100644
--- a/src/korma/sql/engine.clj
+++ b/src/korma/sql/engine.clj
@@ -369,8 +369,19 @@
 ;; Combination Queries
 ;;*****************************************************
 
+;; The usual map-val always wraps subqueries in parenthesis, but that is
+;; not allowed for combined queries in some databases, mainly SQLite.
+;; Therefore we use a lightweight version of map-val that does not do any
+;; wrapping and only handles subqueries.
+(defn- map-combination-val [v]
+  (if-let [sub (utils/sub-query? v)]
+    (do
+      (swap! *bound-params* utils/vconcat (:params sub))
+      (:sql-str sub))
+    (pred-map v)))
+
 (defn- sql-combination-query [type query]
-  (let [sub-query-sqls (map map-val (:queries query))
+  (let [sub-query-sqls (map map-combination-val (:queries query))
         neue-sql (string/join (str " " type " ") sub-query-sqls)]
     (assoc query :sql-str neue-sql)))
 
diff --git a/test/korma/test/core.clj b/test/korma/test/core.clj
index 0ddc440..2c3a161 100644
--- a/test/korma/test/core.clj
+++ b/test/korma/test/core.clj
@@ -802,7 +802,7 @@
 ;;*****************************************************
 
 (deftest test-union
-  (is (= "dry run :: (SELECT \"users\".* FROM \"users\" WHERE (\"users\".\"a\" = ?)) UNION (SELECT \"state\".* FROM \"state\" WHERE (\"state\".\"b\" = ? AND \"state\".\"c\" = ?)) :: [1 2 3]\n"
+  (is (= "dry run :: SELECT \"users\".* FROM \"users\" WHERE (\"users\".\"a\" = ?) UNION SELECT \"state\".* FROM \"state\" WHERE (\"state\".\"b\" = ? AND \"state\".\"c\" = ?) :: [1 2 3]\n"
          (with-out-str (dry-run (union (queries (subselect users
                                                            (where {:a 1}))
                                                 (subselect state
@@ -810,7 +810,7 @@
                                                                    :c 3})))))))))
 
 (deftest test-union-all
-  (is (= "dry run :: (SELECT \"users\".* FROM \"users\" WHERE (\"users\".\"a\" = ?)) UNION ALL (SELECT \"state\".* FROM \"state\" WHERE (\"state\".\"b\" = ? AND \"state\".\"c\" = ?)) :: [1 2 3]\n"
+  (is (= "dry run :: SELECT \"users\".* FROM \"users\" WHERE (\"users\".\"a\" = ?) UNION ALL SELECT \"state\".* FROM \"state\" WHERE (\"state\".\"b\" = ? AND \"state\".\"c\" = ?) :: [1 2 3]\n"
          (with-out-str (dry-run (union-all (queries (subselect users
                                                                (where {:a 1}))
                                                     (subselect state
@@ -818,7 +818,7 @@
                                                                        :c 3})))))))))
 
 (deftest test-intersect
-  (is (= "dry run :: (SELECT \"users\".* FROM \"users\" WHERE (\"users\".\"a\" = ?)) INTERSECT (SELECT \"state\".* FROM \"state\" WHERE (\"state\".\"b\" = ? AND \"state\".\"c\" = ?)) :: [1 2 3]\n"
+  (is (= "dry run :: SELECT \"users\".* FROM \"users\" WHERE (\"users\".\"a\" = ?) INTERSECT SELECT \"state\".* FROM \"state\" WHERE (\"state\".\"b\" = ? AND \"state\".\"c\" = ?) :: [1 2 3]\n"
          (with-out-str (dry-run (intersect (queries (subselect users
                                                                (where {:a 1}))
                                                     (subselect state
@@ -826,7 +826,7 @@
                                                                        :c 3})))))))))
 
 (deftest test-order-by-in-union
-  (is (= "dry run :: (SELECT \"users\".* FROM \"users\" WHERE (\"users\".\"a\" = ?)) UNION (SELECT \"state\".* FROM \"state\" WHERE (\"state\".\"b\" = ? AND \"state\".\"c\" = ?)) ORDER BY \"a\" ASC :: [1 2 3]\n"
+  (is (= "dry run :: SELECT \"users\".* FROM \"users\" WHERE (\"users\".\"a\" = ?) UNION SELECT \"state\".* FROM \"state\" WHERE (\"state\".\"b\" = ? AND \"state\".\"c\" = ?) ORDER BY \"a\" ASC :: [1 2 3]\n"
          (with-out-str (dry-run (union (queries (subselect users
                                                            (where {:a 1}))
                                                 (subselect state
@@ -835,7 +835,7 @@
                                        (order :a)))))))
 
 (deftest test-order-by-in-union-all
-  (is (= "dry run :: (SELECT \"users\".* FROM \"users\" WHERE (\"users\".\"a\" = ?)) UNION ALL (SELECT \"state\".* FROM \"state\" WHERE (\"state\".\"b\" = ? AND \"state\".\"c\" = ?)) ORDER BY \"a\" ASC :: [1 2 3]\n"
+  (is (= "dry run :: SELECT \"users\".* FROM \"users\" WHERE (\"users\".\"a\" = ?) UNION ALL SELECT \"state\".* FROM \"state\" WHERE (\"state\".\"b\" = ? AND \"state\".\"c\" = ?) ORDER BY \"a\" ASC :: [1 2 3]\n"
          (with-out-str (dry-run (union-all (queries (subselect users
                                                                (where {:a 1}))
                                                     (subselect state
@@ -844,7 +844,7 @@
                                            (order :a)))))))
 
 (deftest test-order-by-in-intersect
-  (is (= "dry run :: (SELECT \"users\".* FROM \"users\" WHERE (\"users\".\"a\" = ?)) INTERSECT (SELECT \"state\".* FROM \"state\" WHERE (\"state\".\"b\" = ? AND \"state\".\"c\" = ?)) ORDER BY \"a\" ASC :: [1 2 3]\n"
+  (is (= "dry run :: SELECT \"users\".* FROM \"users\" WHERE (\"users\".\"a\" = ?) INTERSECT SELECT \"state\".* FROM \"state\" WHERE (\"state\".\"b\" = ? AND \"state\".\"c\" = ?) ORDER BY \"a\" ASC :: [1 2 3]\n"
          (with-out-str (dry-run (intersect (queries (subselect users
                                                                (where {:a 1}))
                                                     (subselect state