diff --git a/src/hostapi/coreaudio/pa_mac_core_internal.h b/src/hostapi/coreaudio/pa_mac_core_internal.h
index 9277321..3ebbf1b 100644
--- a/src/hostapi/coreaudio/pa_mac_core_internal.h
+++ b/src/hostapi/coreaudio/pa_mac_core_internal.h
@@ -141,7 +141,7 @@ typedef struct PaMacCoreStream
     AudioBufferList inputAudioBufferList;
     AudioTimeStamp startTime;
     /* FIXME: instead of volatile, these should be properly memory barriered */
-    volatile PaStreamCallbackFlags xrunFlags;
+    volatile uint32_t xrunFlags; /*PaStreamCallbackFlags*/
     volatile enum {
        STOPPED          = 0, /* playback is completely stopped,
                                 and the user has called StopStream(). */
diff --git a/src/hostapi/coreaudio/pa_mac_core_utilities.c b/src/hostapi/coreaudio/pa_mac_core_utilities.c
index 251bbe8..bbd169f 100644
--- a/src/hostapi/coreaudio/pa_mac_core_utilities.c
+++ b/src/hostapi/coreaudio/pa_mac_core_utilities.c
@@ -652,10 +652,10 @@ OSStatus xrunCallback(
 
          if( isInput ) {
             if( stream->inputDevice == inDevice )
-               OSAtomicOr32( paInputOverflow, (uint32_t *)&(stream->xrunFlags) );
+               OSAtomicOr32( paInputOverflow, &stream->xrunFlags );
          } else {
             if( stream->outputDevice == inDevice )
-               OSAtomicOr32( paOutputUnderflow, (uint32_t *)&(stream->xrunFlags) );
+               OSAtomicOr32( paOutputUnderflow, &stream->xrunFlags );
          }
       }