diff --git a/source/scriptinterface/ScriptInterface.h b/source/scriptinterface/ScriptInterface.h
index 31253bf4ae..530c2451ff 100644
--- a/source/scriptinterface/ScriptInterface.h
+++ b/source/scriptinterface/ScriptInterface.h
@@ -404,6 +404,9 @@ public:
 
 private:
 	
+	// Prevent copying of ScriptInterface objects.
+	ScriptInterface(const ScriptInterface&) {}; 
+	
 	bool CallFunction_(JS::HandleValue val, const char* name, uint argc, jsval* argv, JS::MutableHandleValue ret);
 	bool Eval_(const char* code, JS::MutableHandleValue ret);
 	bool Eval_(const wchar_t* code, JS::MutableHandleValue ret);