1 files changed, 12 insertions, 3 deletions
diff --git a/engines/mads/sound.h b/engines/mads/sound.h
index 2c4de6f21d..9674d4198d 100644
--- a/engines/mads/sound.h
+++ b/engines/mads/sound.h
@@ -25,12 +25,21 @@
 
 #include "common/scummsys.h"
 #include "common/queue.h"
-#include "audio/audiostream.h"
-#include "audio/mixer.h"
-#include "mads/nebular/sound_nebular.h"
+
+namespace Audio {
+class Mixer;
+}
+
+namespace OPL {
+class OPL;
+}
 
 namespace MADS {
 
+namespace Nebular {
+class ASound;
+}
+
 class MADSEngine;
 
 class SoundManager {