diff --git a/src/Illuminate/Foundation/Testing/Constraints/SeeInOrder.php b/src/Illuminate/Foundation/Testing/Constraints/SeeInOrder.php
index c56edaa6fdcb..26f45f89411a 100644
--- a/src/Illuminate/Foundation/Testing/Constraints/SeeInOrder.php
+++ b/src/Illuminate/Foundation/Testing/Constraints/SeeInOrder.php
@@ -38,7 +38,7 @@ public function __construct($content)
      * @param  array  $values
      * @return bool
      */
-    public function matches($values)
+    public function matches($values): bool
     {
         $position = 0;
 
@@ -67,7 +67,7 @@ public function matches($values)
      * @param  array  $values
      * @return string
      */
-    public function failureDescription($values)
+    public function failureDescription($values): string
     {
         return sprintf(
             'Failed asserting that \'%s\' contains "%s" in specified order.',
@@ -81,7 +81,7 @@ public function failureDescription($values)
      *
      * @return string
      */
-    public function toString()
+    public function toString(): string
     {
         return (new ReflectionClass($this))->name;
     }