diff --git a/mozilla/plugin/oji/MRJ/plugin/Source/BackwardAdapter.cpp b/mozilla/plugin/oji/MRJ/plugin/Source/BackwardAdapter.cpp
index d0b63a8c7bc..e5047c6f518 100644
--- a/mozilla/plugin/oji/MRJ/plugin/Source/BackwardAdapter.cpp
+++ b/mozilla/plugin/oji/MRJ/plugin/Source/BackwardAdapter.cpp
@@ -55,6 +55,7 @@
 #include "nsDebug.h"
 #include "nsIJRILiveConnectPlugin.h"
 #include "nsIJRILiveConnectPIPeer.h"
+#include "nsIPluginInputStream.h"
 #include "nsObsoleteModuleLoading.h"
 
 #ifdef XP_MAC