diff --git a/mozilla/extensions/java/xpcom/src/nsJavaXPCOMBindingUtils.h b/mozilla/extensions/java/xpcom/src/nsJavaXPCOMBindingUtils.h
index 667aed07cbe..d9c0a6b0bc2 100644
--- a/mozilla/extensions/java/xpcom/src/nsJavaXPCOMBindingUtils.h
+++ b/mozilla/extensions/java/xpcom/src/nsJavaXPCOMBindingUtils.h
@@ -50,6 +50,12 @@
 #define LOG(x)  /* nothing */
 #endif
 
+#if defined(XP_WIN) || defined(XP_MAC)
+#define JX_EXPORT   JNIEXPORT
+#else
+#define JX_EXPORT   JNIEXPORT NS_EXPORT
+#endif
+
 
 /*********************
  * Java JNI globals