diff --git a/src/s_sound.h b/src/s_sound.h
index 6e3de6101189b036f33184a11bff8813ff174120..4ac3c70bf0d4a76f759e166ee0db3c682894ee5f 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;