diff --git a/apps/openmw/mwworld/livecellref.hpp b/apps/openmw/mwworld/livecellref.hpp
index b2089fa7ae..b2e4d6d567 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 d9f5697bd1..19e3d48822 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