diff --git a/reference/datetime/dateperiod/construct.xml b/reference/datetime/dateperiod/construct.xml
index 29e990435b..669dd3dc06 100644
--- a/reference/datetime/dateperiod/construct.xml
+++ b/reference/datetime/dateperiod/construct.xml
@@ -107,7 +107,7 @@
        <entry>5.5.8</entry>
        <entry>
         <parameter>end</parameter> type changed to
-        <interfacename>DateTimeImmutable</interfacename>.
+        <interfacename>DateTimeInterface</interfacename>.
         Previously, <classname>DateTime</classname>.
        </entry>
       </row>
@@ -115,7 +115,7 @@
        <entry>5.5.0</entry>
        <entry>
         <parameter>start</parameter> type changed to
-        <interfacename>DateTimeImmutable</interfacename>.
+        <interfacename>DateTimeInterface</interfacename>.
         Previously, <classname>DateTime</classname>.
        </entry>
       </row>