diff --git a/calendar/modules/shell/src/nsCalendarShell.cpp b/calendar/modules/shell/src/nsCalendarShell.cpp
index 7a9b557eac76..23e2cb08bc15 100644
--- a/calendar/modules/shell/src/nsCalendarShell.cpp
+++ b/calendar/modules/shell/src/nsCalendarShell.cpp
@@ -123,6 +123,7 @@ static NS_DEFINE_IID(kCSMTPServiceCID,      NS_SMTP_SERVICE_CID);
 static NS_DEFINE_IID(kCMessageCID,          NS_MESSAGE_CID);
 static NS_DEFINE_IID(kCMIMEMessageCID,      NS_MIME_MESSAGE_CID);
 static NS_DEFINE_IID(kCMIMEBodyPartCID,     NS_MIME_BODY_PART_CID);
+static NS_DEFINE_IID(kCMIMEBasicBodyPartCID,     NS_MIME_BASIC_BODY_PART_CID);
 static NS_DEFINE_IID(kCMIMEServiceCID,      NS_MIME_SERVICE_CID);
 
 #include "nsXPFCMethodInvokerCommand.h"
@@ -906,6 +907,7 @@ nsresult nsCalendarShell::RegisterFactories()
   nsRepository::RegisterFactory(kCMessageCID, XPFC_DLL, PR_FALSE, PR_FALSE);
   nsRepository::RegisterFactory(kCMIMEMessageCID, XPFC_DLL, PR_FALSE, PR_FALSE);
   nsRepository::RegisterFactory(kCMIMEBodyPartCID, XPFC_DLL, PR_FALSE, PR_FALSE);
+  nsRepository::RegisterFactory(kCMIMEBasicBodyPartCID, XPFC_DLL, PR_FALSE, PR_FALSE);
 
   return NS_OK;
 }