diff --git a/apps/openmw/mwworld/livecellref.hpp b/apps/openmw/mwworld/livecellref.hpp
index b2089fa7a..b2e4d6d56 100644
--- a/apps/openmw/mwworld/livecellref.hpp
+++ b/apps/openmw/mwworld/livecellref.hpp
@@ -9,7 +9,7 @@
 
 namespace ESM
 {
-    class ObjectState;
+    struct ObjectState;
 }
 
 namespace MWWorld
diff --git a/apps/openmw/mwworld/refdata.hpp b/apps/openmw/mwworld/refdata.hpp
index d9f5697bd..19e3d4882 100644
--- a/apps/openmw/mwworld/refdata.hpp
+++ b/apps/openmw/mwworld/refdata.hpp
@@ -14,7 +14,7 @@ namespace ESM
 {
     class Script;
     class CellRef;
-    class ObjectState;
+    struct ObjectState;
 }
 
 namespace MWWorld