diff --git a/src/Utilities/Arrays.php b/src/Utilities/Arrays.php
index f994950..d976226 100644
--- a/src/Utilities/Arrays.php
+++ b/src/Utilities/Arrays.php
@@ -1506,7 +1506,7 @@ class Arrays
      *
      * @param array $array   The array to verify
      * @param mixed $element The element who index / key is needed
-     * @return bool|null|mixed
+     * @return bool|mixed|null
      */
     public static function getIndexOf(array $array, $element)
     {
@@ -1594,7 +1594,7 @@ class Arrays
      *
      * @param array $array   The array with elements
      * @param mixed $element Element for who next element should be returned
-     * @return null|mixed
+     * @return mixed|null
      */
     public static function getNextElement(array $array, $element)
     {
@@ -1606,7 +1606,7 @@ class Arrays
      *
      * @param array $array   The array with elements
      * @param mixed $element Element for who previous element should be returned
-     * @return null|mixed
+     * @return mixed|null
      */
     public static function getPreviousElement(array $array, $element)
     {
diff --git a/src/Utilities/Date.php b/src/Utilities/Date.php
index b6f33c4..8b2afdb 100644
--- a/src/Utilities/Date.php
+++ b/src/Utilities/Date.php
@@ -68,7 +68,7 @@ class Date
      *
      * @param int $period The period, type of period. One of DatePeriod class constants, e.g. DatePeriod::LAST_WEEK.
      * @throws Exception
-     * @return null|DatePeriod
+     * @return DatePeriod|null
      */
     public static function getDatesForPeriod($period)
     {
diff --git a/src/Utilities/QueryBuilderUtility.php b/src/Utilities/QueryBuilderUtility.php
index 0e87ed1..69cc89c 100644
--- a/src/Utilities/QueryBuilderUtility.php
+++ b/src/Utilities/QueryBuilderUtility.php
@@ -27,7 +27,7 @@ class QueryBuilderUtility
      * If null is returned, alias was not found.
      *
      * @param QueryBuilder $queryBuilder The query builder to retrieve root alias
-     * @return null|string
+     * @return string|null
      */
     public static function getRootAlias(QueryBuilder $queryBuilder)
     {
@@ -52,7 +52,7 @@ class QueryBuilderUtility
      *
      * @param QueryBuilder $queryBuilder The query builder to verify
      * @param string       $property     Name of property that maybe is joined
-     * @return null|string
+     * @return string|null
      */
     public static function getJoinedPropertyAlias(QueryBuilder $queryBuilder, $property)
     {
diff --git a/src/Utilities/Reflection.php b/src/Utilities/Reflection.php
index c3fbafe..fb8e3fe 100644
--- a/src/Utilities/Reflection.php
+++ b/src/Utilities/Reflection.php
@@ -577,7 +577,7 @@ class Reflection
      * @param string              $property Name of the property
      * @param int                 $filter   (optional) Filter of properties. Uses \ReflectionProperty class constants.
      *                                      By default all properties are allowed / processed.
-     * @return null|\ReflectionProperty
+     * @return \ReflectionProperty|null
      */
     public static function getProperty($class, $property, $filter = null)
     {
diff --git a/tests/Utilities/QueryBuilderUtilityTest.php b/tests/Utilities/QueryBuilderUtilityTest.php
index 2b6894c..3181a35 100644
--- a/tests/Utilities/QueryBuilderUtilityTest.php
+++ b/tests/Utilities/QueryBuilderUtilityTest.php
@@ -33,7 +33,7 @@ class QueryBuilderUtilityTest extends BaseTestCase
 
     /**
      * @param QueryBuilder $queryBuilder The query builder to retrieve root alias
-     * @param null|string  $rootAlias    Expected root alias of given query builder
+     * @param string|null  $rootAlias    Expected root alias of given query builder
      *
      * @dataProvider provideQueryBuilderAndRootAlias
      */
@@ -45,7 +45,7 @@ class QueryBuilderUtilityTest extends BaseTestCase
     /**
      * @param QueryBuilder $queryBuilder  The query builder to verify
      * @param string       $propertyName  Name of property that maybe is joined
-     * @param null|string  $propertyAlias Expected alias of given property joined in given query builder
+     * @param string|null  $propertyAlias Expected alias of given property joined in given query builder
      *
      * @dataProvider provideQueryBuilderAndPropertyAlias
      */