diff --git a/Datatypes/Address.php b/Datatypes/Address.php
index 5592e4a99..7ef8db125 100644
--- a/Datatypes/Address.php
+++ b/Datatypes/Address.php
@@ -151,7 +151,7 @@ class Address implements \JsonSerializable
     /**
      * {@inheritdoc}
      */
-    public function jsonSerialize(int $option = 0) : string
+    public function jsonSerialize(int $option = 0)
     {
         return $this->toArray();
     }
diff --git a/Datatypes/Location.php b/Datatypes/Location.php
index 05067b1fb..c5a8e17a8 100644
--- a/Datatypes/Location.php
+++ b/Datatypes/Location.php
@@ -245,7 +245,7 @@ class Location implements \JsonSerializable, \Serializable
     /**
      * {@inheritdoc}
      */
-    public function jsonSerialize() : string
+    public function jsonSerialize()
     {
         return $this->toArray();
     }