diff --git a/reference/datetime/datetimeimmutable/construct.xml b/reference/datetime/datetimeimmutable/construct.xml
index 88ef97ea44..0d9b384bb2 100644
--- a/reference/datetime/datetimeimmutable/construct.xml
+++ b/reference/datetime/datetimeimmutable/construct.xml
@@ -14,13 +14,13 @@
   <constructorsynopsis role="oop">
    <modifier>public</modifier> <methodname>DateTimeImmutable::__construct</methodname>
    <methodparam choice="opt"><type>string</type><parameter>time</parameter><initializer>"now"</initializer></methodparam>
-   <methodparam choice="opt"><type>DateTimeZone</type><parameter>timezone</parameter><initializer>&null;</initializer></methodparam>
+   <methodparam choice="opt"><type>DateTimeZone</type><parameter>object</parameter><initializer>&null;</initializer></methodparam>
   </constructorsynopsis>
   <para>&style.procedural;</para>
   <methodsynopsis role="procedural">
    <type>DateTimeImmutable</type><methodname>date_create_immutable</methodname>
    <methodparam choice="opt"><type>string</type><parameter>time</parameter><initializer>"now"</initializer></methodparam>
-   <methodparam choice="opt"><type>DateTimeZone</type><parameter>timezone</parameter><initializer>&null;</initializer></methodparam>
+   <methodparam choice="opt"><type>DateTimeZone</type><parameter>object</parameter><initializer>&null;</initializer></methodparam>
   </methodsynopsis>
   <para>
    Like <methodname>DateTime::__construct</methodname> but works with