diff --git a/engines/zvision/scripting/effects/music_effect.cpp b/engines/zvision/scripting/effects/music_effect.cpp
index 3d3fc887518..6c1a5f7376d 100644
--- a/engines/zvision/scripting/effects/music_effect.cpp
+++ b/engines/zvision/scripting/effects/music_effect.cpp
@@ -36,7 +36,7 @@
 
 namespace ZVision {
 
-MusicNode::MusicNode(ZVision *engine, uint32 key, Common::String &filename, bool loop, int8 volume)
+MusicNode::MusicNode(ZVision *engine, uint32 key, Common::String &filename, bool loop, uint8 volume)
 	: MusicNodeBASE(engine, key, SCRIPTING_EFFECT_AUDIO) {
 	_loop = loop;
 	_volume = volume;
diff --git a/engines/zvision/scripting/effects/music_effect.h b/engines/zvision/scripting/effects/music_effect.h
index f6cb4a5a1c5..7657be8e095 100644
--- a/engines/zvision/scripting/effects/music_effect.h
+++ b/engines/zvision/scripting/effects/music_effect.h
@@ -57,7 +57,7 @@ public:
 
 class MusicNode : public MusicNodeBASE {
 public:
-	MusicNode(ZVision *engine, uint32 key, Common::String &file, bool loop, int8 volume);
+	MusicNode(ZVision *engine, uint32 key, Common::String &file, bool loop, uint8 volume);
 	~MusicNode();
 
 	/**