diff --git a/sys/osxaudio/gstosxaudiosrc.h b/sys/osxaudio/gstosxaudiosrc.h
index 163303c464..0590a74222 100644
--- a/sys/osxaudio/gstosxaudiosrc.h
+++ b/sys/osxaudio/gstosxaudiosrc.h
@@ -57,6 +57,8 @@ G_BEGIN_DECLS
   (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_OSX_AUDIO_SRC,GstOsxAudioSrc))
 #define GST_OSX_AUDIO_SRC_CLASS(klass) \
   (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_OSX_AUDIO_SRC,GstOsxAudioSrcClass))
+#define GST_IS_OSX_AUDIO_SRC(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_OSX_AUDIO_SRC))
 
 typedef struct _GstOsxAudioSrc GstOsxAudioSrc;
 typedef struct _GstOsxAudioSrcClass GstOsxAudioSrcClass;