diff --git a/mingw-w64-headers/include/mmsystem.h b/mingw-w64-headers/include/mmsystem.h
index c021d54..7ec2e8b 100644
--- a/mingw-w64-headers/include/mmsystem.h
+++ b/mingw-w64-headers/include/mmsystem.h
@@ -302,6 +302,7 @@
 #define WAVE_MAPPED 0x0004
 #define WAVE_FORMAT_DIRECT 0x0008
 #define WAVE_FORMAT_DIRECT_QUERY (WAVE_FORMAT_QUERY | WAVE_FORMAT_DIRECT)
+#define WAVE_MAPPED_DEFAULT_COMMUNICATION_DEVICE 0x0010
 
   typedef struct wavehdr_tag {
     LPSTR lpData;