diff --git a/rdpsnd_libao.c b/rdpsnd_libao.c
index ec06b34..2509815 100644
--- a/rdpsnd_libao.c
+++ b/rdpsnd_libao.c
@@ -240,7 +240,7 @@ wave_out_play(void)
 		out->p += len;
 	}
 
-	ao_play(o_device, outbuf, len);
+	ao_play(o_device, (char*)outbuf, len);
 
 	gettimeofday(&tv, NULL);