diff --git a/runtime/lib/query/Criteria.php b/runtime/lib/query/Criteria.php
index 231b8552d..147f31364 100644
--- a/runtime/lib/query/Criteria.php
+++ b/runtime/lib/query/Criteria.php
@@ -822,7 +822,7 @@ public function combine($criterions = array(), $operator = self::LOGICAL_AND, $n
             $firstCriterion->$operatorMethod($criterion);
         }
         if ($name === null) {
-            $this->add($firstCriterion, null, null);
+            $this->addAnd($firstCriterion, null, null);
         } else {
             $this->addCond($name, $firstCriterion, null, null);
         }
diff --git a/test/testsuite/runtime/query/ModelCriteriaTest.php b/test/testsuite/runtime/query/ModelCriteriaTest.php
index 949aa1f51..0348058c6 100644
--- a/test/testsuite/runtime/query/ModelCriteriaTest.php
+++ b/test/testsuite/runtime/query/ModelCriteriaTest.php
@@ -2496,6 +2496,29 @@ public function testExistsWithNonExistentCondition()
         $c->where('b.Title = ?', 'jenexistepas');
         $this->assertFalse($c->exists());
     }
+
+    public function testCombineAndFilterBy()
+    {
+        $params = array();
+        $sql = "SELECT  FROM `book` WHERE ((book.TITLE LIKE :p1 OR book.ISBN LIKE :p2) AND book.TITLE LIKE :p3)";
+        $c = BookQuery::create()
+            ->condition('u1', 'book.TITLE LIKE ?', '%test1%')
+            ->condition('u2', 'book.ISBN LIKE ?', '%test2%')
+            ->combine(array('u1', 'u2'), 'or')
+            ->filterByTitle('%test3%');
+        $result = BasePeer::createSelectSql($c, $params);
+        $this->assertEquals($result, $sql);
+
+        $params = array();
+        $sql = "SELECT  FROM `book` WHERE (book.TITLE LIKE :p1 AND (book.TITLE LIKE :p2 OR book.ISBN LIKE :p3))";
+        $c = BookQuery::create()
+            ->filterByTitle('%test3%')
+            ->condition('u1', 'book.TITLE LIKE ?', '%test1%')
+            ->condition('u2', 'book.ISBN LIKE ?', '%test2%')
+            ->combine(array('u1', 'u2'), 'or');
+        $result = BasePeer::createSelectSql($c, $params);
+        $this->assertEquals($result, $sql);
+    }
 }
 
 class TestableModelCriteria extends ModelCriteria