diff --git a/src/Illuminate/Support/Str.php b/src/Illuminate/Support/Str.php
index bbe21250872a..f866cd45fee2 100644
--- a/src/Illuminate/Support/Str.php
+++ b/src/Illuminate/Support/Str.php
@@ -221,14 +221,14 @@ public static function camel($value)
      *
      * @param  string  $subject
      * @param  int  $index
-     * @return string|null
+     * @return string|false
      */
     public static function charAt($subject, $index)
     {
         $length = mb_strlen($subject);
 
         if ($index < 0 ? $index < -$length : $index > $length - 1) {
-            return null;
+            return false;
         }
 
         return mb_substr($subject, $index, 1);
diff --git a/src/Illuminate/Support/Stringable.php b/src/Illuminate/Support/Stringable.php
index 30539394f019..838814987284 100644
--- a/src/Illuminate/Support/Stringable.php
+++ b/src/Illuminate/Support/Stringable.php
@@ -103,7 +103,7 @@ public function basename($suffix = '')
      * Get the character at the specified index.
      *
      * @param  int  $index
-     * @return string|null
+     * @return string|false
      */
     public function charAt($index)
     {