diff --git a/libao2/ao_sdl.c b/libao2/ao_sdl.c
index 9bb141ff6b..cb9f277bf9 100644
--- a/libao2/ao_sdl.c
+++ b/libao2/ao_sdl.c
@@ -40,7 +40,7 @@ LIBAO_EXTERN(sdl)
 #undef USE_SDL_INTERNAL_MIXER
 
 // Samplesize used by the SDLlib AudioSpec struct
-#ifdef WIN32
+#if defined(WIN32) || defined(SYS_AMIGAOS4)
 #define SAMPLESIZE 2048
 #else
 #define SAMPLESIZE 1024