diff --git a/cake/libs/router.php b/cake/libs/router.php
index 77443b3cb..35c9ad9ba 100644
--- a/cake/libs/router.php
+++ b/cake/libs/router.php
@@ -1074,7 +1074,7 @@ class Router extends Object {
 			$out = $q;
 			$q = $extra;
 		}
-		$out .= http_build_query($q);
+		$out .= http_build_query($q, null, '&');
 		if (strpos($out, '?') !== 0) {
 			$out = '?' . $out;
 		}
diff --git a/cake/tests/cases/libs/router.test.php b/cake/tests/cases/libs/router.test.php
index 03e570ae7..96dc183e9 100644
--- a/cake/tests/cases/libs/router.test.php
+++ b/cake/tests/cases/libs/router.test.php
@@ -896,6 +896,13 @@ class RouterTest extends UnitTestCase {
 		$expected .= '&more=test+data';
 		$result = Router::url(array('controller' => 'posts', 'action'=>'index', '0', '?' => array('var' => 'test', 'var2' => 'test2', 'more' => 'test data')));
 		$this->assertEqual($result, $expected);
+
+		// Test bug #4614
+		$restore = ini_get('arg_separator.output');
+		ini_set('arg_separator.output', '&');
+		$result = Router::url(array('controller' => 'posts', 'action'=>'index', '0', '?' => array('var' => 'test', 'var2' => 'test2', 'more' => 'test data')));
+		$this->assertEqual($result, $expected);
+		ini_set('arg_separator.output', $restore);
 	}
 
 	function testNamedArgsUrlGeneration() {