diff --git a/src/inventory.h b/src/inventory.h
index 53495c6e..9d6020a8 100644
--- a/src/inventory.h
+++ b/src/inventory.h
@@ -558,7 +558,7 @@ struct InventoryContext
 	{}
 };
 
-class InventoryAction;
+struct InventoryAction;
 
 class InventoryManager
 {