diff --git a/mozilla/calendar/base/src/calICSService.cpp b/mozilla/calendar/base/src/calICSService.cpp
index f249cb68f68..4fbc44944fb 100644
--- a/mozilla/calendar/base/src/calICSService.cpp
+++ b/mozilla/calendar/base/src/calICSService.cpp
@@ -39,6 +39,7 @@
 #include "nsStringStream.h"
 #ifndef MOZILLA_1_8_BRANCH
 #include "nsIClassInfoImpl.h"
+#include "nsComponentManagerUtils.h"
 #endif
 #include "calICSService.h"
 #include "calTimezoneService.h"