diff --git a/src/hostapi/coreaudio/pa_mac_core_internal.h b/src/hostapi/coreaudio/pa_mac_core_internal.h
index 291304c..1797cba 100644
--- a/src/hostapi/coreaudio/pa_mac_core_internal.h
+++ b/src/hostapi/coreaudio/pa_mac_core_internal.h
@@ -61,10 +61,11 @@
 #ifndef PA_MAC_CORE_INTERNAL_H__
 #define PA_MAC_CORE_INTERNAL_H__
 
+#include <CoreAudio/CoreAudio.h>
+#include <CoreServices/CoreServices.h>
 #include <AudioUnit/AudioUnit.h>
 #include <AudioToolbox/AudioToolbox.h>
 
-
 #include "portaudio.h"
 #include "pa_util.h"
 #include "pa_hostapi.h"