diff --git a/lib/Cake/Model/Behavior/TreeBehavior.php b/lib/Cake/Model/Behavior/TreeBehavior.php
index 4125df2f82c..244e839eb5e 100644
--- a/lib/Cake/Model/Behavior/TreeBehavior.php
+++ b/lib/Cake/Model/Behavior/TreeBehavior.php
@@ -409,7 +409,7 @@ public function getParentNode(Model $Model, $id = null, $fields = null, $recursi
 			extract(array_merge(array('id' => null), $id));
 		}
 		$overrideRecursive = $recursive;
-		if (empty ($id)) {
+		if (empty($id)) {
 			$id = $Model->id;
 		}
 		extract($this->settings[$Model->alias]);
@@ -442,7 +442,7 @@ public function getPath(Model $Model, $id = null, $fields = null, $recursive = n
 			extract(array_merge(array('id' => null), $id));
 		}
 		$overrideRecursive = $recursive;
-		if (empty ($id)) {
+		if (empty($id)) {
 			$id = $Model->id;
 		}
 		extract($this->settings[$Model->alias]);
@@ -481,7 +481,7 @@ public function moveDown(Model $Model, $id = null, $number = 1) {
 		if (!$number) {
 			return false;
 		}
-		if (empty ($id)) {
+		if (empty($id)) {
 			$id = $Model->id;
 		}
 		extract($this->settings[$Model->alias]);
@@ -539,7 +539,7 @@ public function moveUp(Model $Model, $id = null, $number = 1) {
 		if (!$number) {
 			return false;
 		}
-		if (empty ($id)) {
+		if (empty($id)) {
 			$id = $Model->id;
 		}
 		extract($this->settings[$Model->alias]);
@@ -864,7 +864,7 @@ protected function _setParent(Model $Model, $parentId = null, $created = false)
 		)));
 		$edge = $this->_getMax($Model, $scope, $right, $recursive, $created);
 
-		if (empty ($parentId)) {
+		if (empty($parentId)) {
 			$this->_sync($Model, $edge - $node[$left] + 1, '+', 'BETWEEN ' . $node[$left] . ' AND ' . $node[$right], $created);
 			$this->_sync($Model, $node[$right] - $node[$left] + 1, '-', '> ' . $node[$left], $created);
 		} else {