diff --git a/mozilla/widget/src/xpwidgets/nsFileSpecWithUIImpl.cpp b/mozilla/widget/src/xpwidgets/nsFileSpecWithUIImpl.cpp
index 2825601055a..2c7f05ef0e2 100644
--- a/mozilla/widget/src/xpwidgets/nsFileSpecWithUIImpl.cpp
+++ b/mozilla/widget/src/xpwidgets/nsFileSpecWithUIImpl.cpp
@@ -29,6 +29,7 @@
 #include "nsIWebShell.h"
 #include "nsIDocumentViewer.h"
 #include "nsIPresShell.h"
+#include "nsIViewManager.h"
 
 #undef NS_FILE_FAILURE
 #define NS_FILE_FAILURE NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_FILES,(0xFFFF))