diff --git a/classes/query_builder.php b/classes/query_builder.php
index a9059cd..a415661 100644
--- a/classes/query_builder.php
+++ b/classes/query_builder.php
@@ -698,12 +698,12 @@ class Query_Builder {
 		$key = $this->quote_ident($key);
 		$params = array_fill(0, count($val), '?');
 
-		foreach($val as &$v)
+		foreach($val as $v)
 		{
 			$this->values[] = $v;
 		}
 
-		$string = $key . " {$in} ".implode(',', $params).') ';
+		$string = $key . " {$in} (".implode(',', $params).') ';
 
 		$this->query_map[] = array(
 			'type' => 'where_in',
@@ -1396,7 +1396,7 @@ class Query_Builder {
 			break;
 		}
 
-		//echo $sql . '<br />';
+		// echo $sql . '<br />';
 
 		return $sql;
 	}
diff --git a/tests/core/db_qb_test.php b/tests/core/db_qb_test.php
index 19ff326..e0b539b 100644
--- a/tests/core/db_qb_test.php
+++ b/tests/core/db_qb_test.php
@@ -173,6 +173,19 @@ abstract class QBTest extends UnitTestCase {
 
 	// --------------------------------------------------------------------------
 
+	public function TestWhereIn()
+	{
+		if (empty($this->db)) return;
+
+		$query = $this->db->from('create_test')
+			->where_in('id', array(0, 6, 56, 563, 341))
+			->get();
+
+		$this->assertIsA($query, 'PDOStatement');
+	}
+
+	// --------------------------------------------------------------------------
+
 	public function TestSelectAvg()
 	{
 		if (empty($this->db))  return;
diff --git a/tests/db_files/FB_TEST_DB.FDB b/tests/db_files/FB_TEST_DB.FDB
index 6939e6f..4214e14 100644
Binary files a/tests/db_files/FB_TEST_DB.FDB and b/tests/db_files/FB_TEST_DB.FDB differ