diff --git a/mozilla/modules/oji/public/nsIJVMManager.h b/mozilla/modules/oji/public/nsIJVMManager.h
index eca97b4a398..dbf4bec6814 100644
--- a/mozilla/modules/oji/public/nsIJVMManager.h
+++ b/mozilla/modules/oji/public/nsIJVMManager.h
@@ -31,6 +31,10 @@
 
 #include "nsISupports.h"
 
+#ifndef JNI_H
+#include "jni.h"
+#endif
+
 ////////////////////////////////////////////////////////////////////////////////
 // Java VM Plugin Manager
 // This interface defines additional entry points that are available