diff --git a/src/s_sound.h b/src/s_sound.h
index 6e3de6101..4ac3c70bf 100644
--- a/src/s_sound.h
+++ b/src/s_sound.h
@@ -87,6 +87,9 @@ typedef struct
 	// origin of sound
 	const void *origin;
 
+	// initial volume of sound, which is applied after distance and direction
+	INT32 volume;
+
 	// handle of the sound being played
 	INT32 handle;