diff --git a/cake/libs/router.php b/cake/libs/router.php
index c5042c9ea0d..985cc587968 100644
--- a/cake/libs/router.php
+++ b/cake/libs/router.php
@@ -186,7 +186,7 @@ function __setPrefixes() {
 			$this->__prefixes[] = $this->__admin = $routing['admin'];
 		}
 		if (isset($routing['prefixes'])) {
-			$this->__prefixes = array_merge($this->__prefixes, $routing['prefixes']);
+			$this->__prefixes = array_merge($this->__prefixes, (array)$routing['prefixes']);
 		}
 	}
 /**
diff --git a/cake/tests/cases/libs/router.test.php b/cake/tests/cases/libs/router.test.php
index b2d36e88ef5..d183aed714b 100644
--- a/cake/tests/cases/libs/router.test.php
+++ b/cake/tests/cases/libs/router.test.php
@@ -1017,6 +1017,31 @@ function testRouteSymmetry() {
 		$this->assertEqual($result, $expected);
 	}
 
+/**
+ * Test that Routing.prefixes and Routing.admin are used when a Router instance is created
+ * or reset
+ *
+ * @return void
+ **/
+	function testRoutingPrefixesSetting() {
+		$restore = Configure::read('Routing');
+
+		Configure::write('Routing.admin', 'admin');
+		Configure::write('Routing.prefixes', array('member', 'super_user'));
+		Router::reload();
+		$result = Router::prefixes();
+		$expected = array('admin', 'member', 'super_user');
+		$this->assertEqual($result, $expected);
+
+		Configure::write('Routing.prefixes', 'member');
+		Router::reload();
+		$result = Router::prefixes();
+		$expected = array('admin', 'member');
+		$this->assertEqual($result, $expected);
+
+		Configure::write('Routing', $restore);
+	}
+
 /**
  * testAdminRouting method
  *