diff --git a/lib/Doctrine/DBAL/Query/QueryBuilder.php b/lib/Doctrine/DBAL/Query/QueryBuilder.php
index ff66c8b8685..13efeb2b5df 100644
--- a/lib/Doctrine/DBAL/Query/QueryBuilder.php
+++ b/lib/Doctrine/DBAL/Query/QueryBuilder.php
@@ -1072,7 +1072,13 @@ public function orHaving($having)
      */
     public function orderBy(string $sort, ?string $order = null)
     {
-        $this->orderBy = [$sort . ' ' . (! $order ? 'ASC' : $order)];
+        $orderBy = $sort;
+
+        if ($order !== null) {
+            $orderBy .= ' ' . $order;
+        }
+
+        $this->orderBy = [$orderBy];
 
         $this->state = self::STATE_DIRTY;
 
@@ -1089,7 +1095,13 @@ public function orderBy(string $sort, ?string $order = null)
      */
     public function addOrderBy(string $sort, ?string $order = null)
     {
-        $this->orderBy[] = $sort . ' ' . (! $order ? 'ASC' : $order);
+        $orderBy = $sort;
+
+        if ($order !== null) {
+            $orderBy .= ' ' . $order;
+        }
+
+        $this->orderBy[] = $orderBy;
 
         $this->state = self::STATE_DIRTY;
 
diff --git a/tests/Doctrine/Tests/DBAL/Query/QueryBuilderTest.php b/tests/Doctrine/Tests/DBAL/Query/QueryBuilderTest.php
index a8ee838be4a..ba4dd8afd9a 100644
--- a/tests/Doctrine/Tests/DBAL/Query/QueryBuilderTest.php
+++ b/tests/Doctrine/Tests/DBAL/Query/QueryBuilderTest.php
@@ -331,7 +331,7 @@ public function testSelectOrderBy() : void
            ->from('users', 'u')
            ->orderBy('u.name');
 
-        self::assertEquals('SELECT u.*, p.* FROM users u ORDER BY u.name ASC', (string) $qb);
+        self::assertEquals('SELECT u.*, p.* FROM users u ORDER BY u.name', (string) $qb);
     }
 
     public function testSelectAddOrderBy() : void
@@ -344,7 +344,7 @@ public function testSelectAddOrderBy() : void
            ->orderBy('u.name')
            ->addOrderBy('u.username', 'DESC');
 
-        self::assertEquals('SELECT u.*, p.* FROM users u ORDER BY u.name ASC, u.username DESC', (string) $qb);
+        self::assertEquals('SELECT u.*, p.* FROM users u ORDER BY u.name, u.username DESC', (string) $qb);
     }
 
     public function testSelectAddAddOrderBy() : void
@@ -357,7 +357,7 @@ public function testSelectAddAddOrderBy() : void
            ->addOrderBy('u.name')
            ->addOrderBy('u.username', 'DESC');
 
-        self::assertEquals('SELECT u.*, p.* FROM users u ORDER BY u.name ASC, u.username DESC', (string) $qb);
+        self::assertEquals('SELECT u.*, p.* FROM users u ORDER BY u.name, u.username DESC', (string) $qb);
     }
 
     public function testEmptySelect() : void