diff --git a/mozilla/calendar/lightning/install.rdf b/mozilla/calendar/lightning/install.rdf
index ff464b10694..e1f371ddf7a 100644
--- a/mozilla/calendar/lightning/install.rdf
+++ b/mozilla/calendar/lightning/install.rdf
@@ -58,7 +58,6 @@
     <em:description>An integrated calendar for Thunderbird (build @GRE_BUILDID@)</em:description>
 #endif
     <em:creator>Mozilla Calendar Project</em:creator>
-    <em:updateURL>http://www.mozilla.org/projects/calendar/lightning/@TARGET_PLATFORM@/update.rdf</em:updateURL>
     <em:homepageURL>http://www.mozilla.org/projects/calendar/releases/lightning@LIGHTNING_VERSION@.html</em:homepageURL>
     <em:iconURL>chrome://calendar/skin/cal-icon32.png</em:iconURL>
     <em:optionsURL>chrome://messenger/content/preferences/preferences.xul</em:optionsURL>
diff --git a/mozilla/calendar/prototypes/wcap/lightning-wcap/install.rdf b/mozilla/calendar/prototypes/wcap/lightning-wcap/install.rdf
index d2080533cbd..0f637a36c3c 100644
--- a/mozilla/calendar/prototypes/wcap/lightning-wcap/install.rdf
+++ b/mozilla/calendar/prototypes/wcap/lightning-wcap/install.rdf
@@ -26,7 +26,6 @@
         <em:targetPlatform>@TARGET_PLATFORM@</em:targetPlatform>
         <em:creator>Mozilla Calendar Project</em:creator>
         <em:homepageURL>http://www.mozilla.org/projects/calendar/</em:homepageURL>
-        <em:updateURL>http://www.mozilla.org/projects/calendar/releases/%ITEM_ID%/@TARGET_PLATFORM@/update.rdf</em:updateURL>
         <em:iconURL>chrome://calendar/skin/cal-icon32.png</em:iconURL>
     </Description>
 </RDF>
diff --git a/mozilla/calendar/prototypes/wcap/wcap-enabler/install.rdf b/mozilla/calendar/prototypes/wcap/wcap-enabler/install.rdf
index 74f09cbeada..5e176ca1cc3 100644
--- a/mozilla/calendar/prototypes/wcap/wcap-enabler/install.rdf
+++ b/mozilla/calendar/prototypes/wcap/wcap-enabler/install.rdf
@@ -22,7 +22,6 @@
         <em:description>Enables support for the Sun Java System Calendar Server (WCAP) in the Lightning calendar extension.</em:description>
         <em:creator>Mozilla Calendar Project</em:creator>
         <em:homepageURL>http://www.mozilla.org/projects/calendar/</em:homepageURL>
-        <em:updateURL>http://www.mozilla.org/projects/calendar/releases/%ITEM_ID%/@TARGET_PLATFORM@/update.rdf</em:updateURL>
         <em:iconURL>chrome://calendar/skin/cal-icon32.png</em:iconURL>
     </Description>
 </RDF>