diff --git a/cmAudioPort.h b/cmAudioPort.h
index fc74bbf..711e343 100644
--- a/cmAudioPort.h
+++ b/cmAudioPort.h
@@ -38,6 +38,7 @@ extern "C" {
     kSysErrApRC,
     kInvalidDevIdApRC,
     kAudioPortFileFailApRC,
+    kParamRangeErrorApRC,
     kThreadFailApRC
   };