diff --git a/xpfe/bootstrap/nsNativeAppSupportOS2.cpp b/xpfe/bootstrap/nsNativeAppSupportOS2.cpp
index ad05380759a..acac39f9dee 100644
--- a/xpfe/bootstrap/nsNativeAppSupportOS2.cpp
+++ b/xpfe/bootstrap/nsNativeAppSupportOS2.cpp
@@ -64,6 +64,7 @@
 #include "nsIBaseWindow.h"       
 #include "nsIWidget.h"
 #include "nsIAppShellService.h"
+#include "nsIAppStartup.h"
 #include "nsIProfileInternal.h"
 #include "nsIXULWindow.h"
 #include "nsIInterfaceRequestor.h"