diff --git a/preferences.xml b/preferences.xml
index bdc5fd38f..6bdd82b9b 100644
--- a/preferences.xml
+++ b/preferences.xml
@@ -84,7 +84,7 @@ Started September 2000 by David Megginson, david@megginson.com
    <voice type="bool">true</voice>
    <voices>
     <host type="string" write="n">localhost</host>
-    <port type="string">1314</port>
+    <port type="string" write="n">1314</port>
     <enabled type="bool">false</enabled>
     <atc alias="/sim/sound/voices/voice[0]/text"/>
     <approach alias="/sim/sound/voices/voice[0]/text"/>