diff --git a/README.md b/README.md
index 64476405..eb013d17 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,6 @@
 Yet Another ORM library for Go, aims for developer friendly
 
 ## TODO
-* Complex where query (in)
 * Order
 * Limit
 * Select
diff --git a/orm_test.go b/orm_test.go
index f12d084b..bb318bc6 100644
--- a/orm_test.go
+++ b/orm_test.go
@@ -182,10 +182,42 @@ func TestComplexWhere(t *testing.T) {
 	}
 
 	users = []User{}
-	a := db.Where("name in (?)", []string{"1", "3"}).Find(&users)
-	a.db.Query("SELECT * FROM users WHERE ( name in ($1) )", "'1', '2'")
+	db.Where("name in (?)", []string{"1", "3"}).Find(&users)
 
 	if len(users) != 3 {
 		t.Errorf("Should only found 3 users's name in (1, 3), but have %v", len(users))
 	}
+
+	var user_ids []int64
+	for _, user := range users {
+		user_ids = append(user_ids, user.Id)
+	}
+	users = []User{}
+	db.Where("id in (?)", user_ids).Find(&users)
+	if len(users) != 3 {
+		t.Errorf("Should only found 3 users's name in (1, 3) - search by id, but have %v", len(users))
+	}
+
+	users = []User{}
+	db.Where("name in (?)", []string{"1", "2"}).Find(&users)
+
+	if len(users) != 2 {
+		t.Errorf("Should only found 2 users's name in (1, 2), but have %v", len(users))
+	}
+
+	user_ids = []int64{}
+	for _, user := range users {
+		user_ids = append(user_ids, user.Id)
+	}
+	users = []User{}
+	db.Where("id in (?)", user_ids).Find(&users)
+	if len(users) != 2 {
+		t.Errorf("Should only found 2 users's name in (1, 2) - search by id, but have %v", len(users))
+	}
+
+	users = []User{}
+	db.Where("id in (?)", user_ids[0]).Find(&users)
+	if len(users) != 1 {
+		t.Errorf("Should only found 1 users's name in (1, 2) - search by the first id, but have %v", len(users))
+	}
 }
diff --git a/sql.go b/sql.go
index d8857314..60d6a642 100644
--- a/sql.go
+++ b/sql.go
@@ -144,16 +144,19 @@ func (s *Orm) whereSql() (sql string) {
 			str := "( " + clause["query"].(string) + " )"
 			args := clause["args"].([]interface{})
 			for _, arg := range args {
+				switch reflect.TypeOf(arg).Kind() {
+				case reflect.Slice: // For where("id in (?)", []int64{1,2})
+					v := reflect.ValueOf(arg)
 
-				switch arg.(type) {
-				case []string, []int, []int64, []int32:
 					var temp_marks []string
-					for _ = range arg.([]string) {
+					for i := 0; i < v.Len(); i++ {
 						temp_marks = append(temp_marks, "?")
 					}
+
 					str = strings.Replace(str, "?", strings.Join(temp_marks, ","), 1)
-					for _, a := range arg.([]string) {
-						str = strings.Replace(str, "?", s.addToVars(a), 1)
+
+					for i := 0; i < v.Len(); i++ {
+						str = strings.Replace(str, "?", s.addToVars(v.Index(i).Addr().Interface()), 1)
 					}
 				default:
 					str = strings.Replace(str, "?", s.addToVars(arg), 1)