diff --git a/libao2/ao_sdl.c b/libao2/ao_sdl.c
index 27393b4dd7..1f66c7944a 100644
--- a/libao2/ao_sdl.c
+++ b/libao2/ao_sdl.c
@@ -36,7 +36,7 @@ static ao_info_t info =
 LIBAO_EXTERN(sdl)
 
 // turn this on if you want to use the slower SDL_MixAudio
-#undef USE_SDL_INTERNAL_MIXER
+#define USE_SDL_INTERNAL_MIXER 1
 
 // Samplesize used by the SDLlib AudioSpec struct
 #ifdef WIN32