diff --git a/apps/openmw/mwworld/inventorystore.hpp b/apps/openmw/mwworld/inventorystore.hpp
index ca733b0847..60b89b0b47 100644
--- a/apps/openmw/mwworld/inventorystore.hpp
+++ b/apps/openmw/mwworld/inventorystore.hpp
@@ -10,7 +10,7 @@ namespace MWMechanics
 
 namespace MWWorld
 {
-    struct Environment;
+    class Environment;
 
     ///< \brief Variant of the ContainerStore for NPCs
     class InventoryStore : public ContainerStore