diff --git a/src/CxbxKrnl/EmuDSound.cpp b/src/CxbxKrnl/EmuDSound.cpp
index 7a281e244..b42da4ec7 100644
--- a/src/CxbxKrnl/EmuDSound.cpp
+++ b/src/CxbxKrnl/EmuDSound.cpp
@@ -1451,7 +1451,7 @@ HRESULT WINAPI XTL::EmuIDirectSoundBuffer8_Play
            ");\n",
            GetCurrentThreadId(), pThis, dwReserved1, dwReserved2, dwFlags);
 
-    if(dwFlags & ~(X_DSBPLAY_LOOPING | X_DSBPLAY_FROMSTART))
+    if(dwFlags & ~(X_DSBPLAY_LOOPING | X_DSBPLAY_FROMSTART | X_DSBPLAY_SYNCHPLAYBACK))
         CxbxKrnlCleanup("Unsupported Playing Flags");
 
     // rewind buffer
diff --git a/src/CxbxKrnl/EmuDSound.h b/src/CxbxKrnl/EmuDSound.h
index 75512b65e..9cd6298b6 100644
--- a/src/CxbxKrnl/EmuDSound.h
+++ b/src/CxbxKrnl/EmuDSound.h
@@ -44,6 +44,7 @@
 // EmuIDirectSoundBuffer8_Play flags
 #define X_DSBPLAY_LOOPING       0x00000001
 #define X_DSBPLAY_FROMSTART     0x00000002
+#define X_DSBPLAY_SYNCHPLAYBACK 0x00000004
 
 // EmuIDirectSoundBuffer8_Pause flags
 #define X_DSBPAUSE_RESUME             0x00000000