diff --git a/mailnews/base/util/nsMsgProtocol.h b/mailnews/base/util/nsMsgProtocol.h
index 3e5a494a7bc1..cc506298da7c 100644
--- a/mailnews/base/util/nsMsgProtocol.h
+++ b/mailnews/base/util/nsMsgProtocol.h
@@ -31,7 +31,7 @@
 #include "nsIURL.h"
 #include "nsILoadGroup.h"
 #include "nsCOMPtr.h"
-
+#include "nsIFileSpec.h"
 // This is a helper class used to encapsulate code shared between all of the
 // mailnews protocol objects (imap, news, pop, smtp, etc.) In particular,
 // it unifies the core networking code for the protocols. My hope is that