diff --git a/include/pa_mac_core.h b/include/pa_mac_core.h
index 1d615fe..83e40a6 100644
--- a/include/pa_mac_core.h
+++ b/include/pa_mac_core.h
@@ -46,7 +46,7 @@
 #include "portaudio.h"
 
 #include <AudioUnit/AudioUnit.h>
-//#include <AudioToolbox/AudioToolbox.h>
+#include <AudioToolbox/AudioToolbox.h>
 
 #ifdef __cplusplus
 extern "C" {