diff --git a/man/mosquitto_sub.1.xml b/man/mosquitto_sub.1.xml
index 6a7c5b38..ee9274e4 100644
--- a/man/mosquitto_sub.1.xml
+++ b/man/mosquitto_sub.1.xml
@@ -938,7 +938,6 @@ mosquitto_sub -t 'bbc/#' -T bbc/bbc1 --remove-retained</programlisting>
 					<para>If the payload is not valid JSON, then the error message "Error: Message payload is not valid JSON on topic
 						&lt;topic&gt;" will be printed to stderr.</para></listitem>
 
-				<listitem><para><option>%I</option> ISO-8601 format date and time, e.g. 2016-08-10T09:47:38+0100</para></listitem>
 				<listitem><para><option>%U</option> Unix timestamp with nanoseconds, e.g. 1470818943.786368637</para></listitem>
 			</itemizedlist>
 		</refsect2>