diff --git a/src/engine/dispatch.h b/src/engine/dispatch.h
index 649eb5138..e5514157c 100644
--- a/src/engine/dispatch.h
+++ b/src/engine/dispatch.h
@@ -460,6 +460,8 @@ struct DivMemoryEntry {
 
 struct DivMemoryComposition {
   std::vector<DivMemoryEntry> entries;
+  size_t capacity;
+  size_t used;
 };
 
 class DivEngine;