diff --git a/calendar/installer/windows/packages-static b/calendar/installer/windows/packages-static
index 9237d56995eb..fb3a98560223 100644
--- a/calendar/installer/windows/packages-static
+++ b/calendar/installer/windows/packages-static
@@ -172,7 +172,6 @@ bin\components\xpcom_ds.xpt
 bin\components\xpcom_io.xpt
 bin\components\xpcom_thread.xpt
 bin\components\xpcom_xpti.xpt
-bin\components\xpcom_obsolete.xpt
 bin\components\xpconnect.xpt
 bin\components\xpinstall.xpt
 bin\components\xuldoc.xpt
diff --git a/configure.in b/configure.in
index eb69556059bf..37076000e375 100644
--- a/configure.in
+++ b/configure.in
@@ -4316,6 +4316,7 @@ calendar)
   MOZ_SUNBIRD=1
   MOZ_CALENDAR=1
   MOZ_APP_VERSION=$SUNBIRD_VERSION
+  MOZ_NO_XPCOM_OBSOLETE=1
   MOZ_EXTENSIONS_DEFAULT=
   MOZ_UNIVERSALCHARDET=
   AC_DEFINE(MOZ_SUNBIRD)