diff --git a/src/engine/song.h b/src/engine/song.h
index d87c0af3e..d37a25948 100644
--- a/src/engine/song.h
+++ b/src/engine/song.h
@@ -143,6 +143,7 @@ enum DivSystem {
   DIV_SYSTEM_SID2,
   DIV_SYSTEM_SUPERVISION,
   DIV_SYSTEM_UPD1771C,
+  DIV_SYSTEM_MAX,
 };
 
 enum DivEffectType: unsigned short {