diff --git a/mozilla/include/libmocha.h b/mozilla/include/libmocha.h
index 8a40f6c59fd..2ead173622f 100644
--- a/mozilla/include/libmocha.h
+++ b/mozilla/include/libmocha.h
@@ -31,7 +31,7 @@
 #include "jsapi.h"
 
 /* enable JavaScript Debugger support */
-#if defined (_WIN32) || defined(XP_UNIX) || defined(powerc) || defined(__powerc) || defined(XP_OS2)
+#if defined (_WIN32) || defined(XP_UNIX) || defined(powerc) || defined(__powerc) || defined(XP_OS2) || defined(XP_BEOS)
 #ifdef JAVA
 #define JSDEBUGGER 1 
 #endif